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This Unicode block encodes technical symbols, including keytop labels such as U+232B    erase to the left. Excluded from consideration were symbols that are not normally used in one-dimensional text but are intended for two-dimensional diagrammatic use, such as symbols for electronic circuits. An unusually large expansion space is provided because it is anticipated that a large number of technical symbols could eventually be considered for addition to the Unicode standard.

APL (A Programming language) makes extensive use of functional symbols constructed by composition with other, more primitive functional symbols. It made extensive use of backspace and overstrike mechanisms in early computer implementations. In principle, functional composition is productive in APL; in practice, a relatively small number of composed functional symbols have become standard operators in APL. This relatively small set is encoded in its entirety in this block. All other APL extensions can be encoded by composition of other Unicode characters.


Unicode's Miscellaneous Technical code block reserves the 256 code points from U+2300 to U+23FF, of which 232 are currently assigned.

Mathematical Operators <-- Miscellaneous Technical --> Control Pictures

Number of characters added in each version of the Unicode standard :
Unicode 1.1 : 122
Unicode 3.0 : 32
Unicode 3.2 : 53
Unicode 4.0 : 2
Unicode 4.1 : 11
Unicode 5.0 : 12

Number of characters in each General Category :

Punctuation, Open   Ps :  1
Punctuation, Close  Pe :  1
Symbol, Math        Sm : 38
Symbol, Other       So :192

Number of characters in each Bidirectional Category :

Left To Right    L : 70
Other Neutral   ON :162

The columns below should be interpreted as :

  1. The Unicode code for the character
  2. The character in question
  3. The Unicode name for the character
  4. The Unicode General Category for the character
  5. The Unicode Bidirectional Category for the character
  6. The Unicode version when this character was added

If the characters below show up poorly, or not at all, see Unicode Support for possible solutions.

 

Miscellaneous Technical

     Miscellaneous technical

U+2300   ⌀   diameter sign So ON 1.1
ref U+2205   ∅   empty set (Mathematical Operators)
U+2301   ⌁   electric arrow So ON 3.0
* from ISO 2047
* symbol for End of Transmission
U+2302   ⌂   house So ON 1.1
U+2303   ⌃   up arrowhead So ON 1.1
ref U+005E   ^   circumflex accent (Basic Latin)
ref U+02C4   ˄   modifier letter up arrowhead (Spacing Modifier Letters)
ref U+2038   ‸   caret (General Punctuation)
ref U+2227   ∧   logical and (Mathematical Operators)
U+2304   ⌄   down arrowhead So ON 1.1
ref U+02C5   ˅   modifier letter down arrowhead (Spacing Modifier Letters)
ref U+2228   ∨   logical or (Mathematical Operators)
ref U+2335   ⌵   countersink (Miscellaneous Technical)
U+2305   ⌅   projective So ON 1.1
ref U+22BC   ⊼   nand (Mathematical Operators)
U+2306   ⌆   perspective So ON 1.1
sgml &Barwed; &doublebarwedge;
U+2307   ⌇   wavy line So ON 1.1
ref U+3030   〰   wavy dash (CJK Symbols and Punctuation)

     Ceilings and floors
These characters are tall and narrow mathematical delimiters, in contrast to the quine corners or half brackets. They are also distinct from CJK corner brackets, which are wide quotation marks.

U+2308   ⌈   left ceiling Sm ON 1.1
html &lceil;
sgml &LeftCeiling; &lceil;
aka APL upstile
ref U+2E22   ⸢   top left half bracket (Supplemental Punctuation)
ref U+300C   「   left corner bracket (CJK Symbols and Punctuation)
U+2309   ⌉   right ceiling Sm ON 1.1
html &rceil;
sgml &RightCeiling; &rceil;
ref U+20E7   ⃧   combining annuity symbol (Combining Diacritical Marks for Symbols)
ref U+2E23   ⸣   top right half bracket (Supplemental Punctuation)
U+230A   ⌊   left floor Sm ON 1.1
html &lfloor;
sgml &LeftFloor; &lfloor;
aka APL downstile
ref U+2E24   ⸤   bottom left half bracket (Supplemental Punctuation)
U+230B   ⌋   right floor Sm ON 1.1
html &rfloor;
sgml &RightFloor; &rfloor;
ref U+300D   」   right corner bracket (CJK Symbols and Punctuation)
ref U+2E25   ⸥   bottom right half bracket (Supplemental Punctuation)

     Crops

U+230C   ⌌   bottom right crop So ON 1.1
sgml &drcrop;
* set of four "crop" corners, arranged facing outward
U+230D   ⌍   bottom left crop So ON 1.1
sgml &dlcrop;
U+230E   ⌎   top right crop So ON 1.1
sgml &urcrop;
U+230F   ⌏   top left crop So ON 1.1
sgml &ulcrop;

     Miscellaneous technical

U+2310   ⌐   reversed not sign So ON 1.1
sgml &bnot;
aka beginning of line
ref U+00AC   ¬   not sign (Latin-1 Supplement)
U+2311   ⌑   square lozenge So ON 1.1
aka kissen (pillow)
* used as a command delimiter in some very old computers
U+2312   ⌒   arc So ON 1.1
sgml &profline;
ref U+25E0   ◠   upper half circle (Geometric Shapes)
U+2313   ⌓   segment So ON 1.1
sgml &profsurf;
U+2314   ⌔   sector So ON 1.1
U+2315   ⌕   telephone recorder So ON 1.1
sgml &telrec;
U+2316   ⌖   position indicator So ON 1.1
sgml &target;
U+2317   ⌗   viewdata square So ON 1.1
ref U+22D5   ⋕   equal and parallel to (Mathematical Operators)
U+2318   ⌘   place of interest sign So ON 1.1
aka command key (1.0)
U+2319   ⌙   turned not sign So ON 1.1
aka line marker

     GUI icons

U+231A   ⌚   watch So ON 1.1
U+231B   ⌛   hourglass So ON 1.1

     Quine corners
These form a set of four quine corners, for quincuncial arrangement. They are also used in upper and lower pairs in mathematic, or more rarely in editorial usage as alternatives to half brackets.

U+231C   ⌜   top left corner So ON 1.1
sgml &ulcorn; &ulcorner;
ref U+2E00   ⸀   right angle substitution marker (Supplemental Punctuation)
ref U+2E22   ⸢   top left half bracket (Supplemental Punctuation)
U+231D   ⌝   top right corner So ON 1.1
sgml &urcorn; &urcorner;
U+231E   ⌞   bottom left corner So ON 1.1
sgml &dlcorn; &llcorner;
U+231F   ⌟   bottom right corner So ON 1.1
sgml &drcorn; &lrcorner;

     Integral pieces

U+2320   ⌠   top half integral Sm ON 1.1
ref U+23AE   ⎮   integral extension (Miscellaneous Technical)
U+2321   ⌡   bottom half integral Sm ON 1.1

     Frown and smile

U+2322   ⌢   frown So ON 1.1
sgml &Cap; &frown; &sfrown;
ref U+2040   ⁀   character tie (General Punctuation)
U+2323   ⌣   smile So ON 1.1
sgml &Cup; &smile; &ssmile;
ref U+203F   ‿   undertie (General Punctuation)

     Keyboard symbols

U+2324   ⌤   up arrowhead between two horizontal bars So ON 1.1
aka enter key
U+2325   ⌥   option key So ON 1.1
U+2326   ⌦   erase to the right So ON 1.1
aka delete to the right key
U+2327   ⌧   x in a rectangle box So ON 1.1
aka clear key
U+2328   ⌨   keyboard So ON 1.1

     Angle brackets
These are discouraged for mathematical use because of their canonical equivalence to CJK punctuation.

U+2329   〈   left pointing angle bracket Ps ON 1.1
html &lang;
sgml &lang;
ref U+003C   <   less than sign (Basic Latin)
ref U+2039   ‹   single left pointing angle quotation mark (General Punctuation)
ref U+27E8   ⟨   mathematical left angle bracket (Miscellaneous Mathematical Symbols A)
U+232A   〉   right pointing angle bracket Pe ON 1.1
html &rang;
sgml &rang;
ref U+003E   >   greater than sign (Basic Latin)
ref U+203A   ›   single right pointing angle quotation mark (General Punctuation)
ref U+27E9   ⟩   mathematical right angle bracket (Miscellaneous Mathematical Symbols A)

     Keyboard symbol

U+232B   ⌫   erase to the left So ON 1.1
aka delete to the left key

     Chemistry symbol

U+232C   ⌬   benzene ring So ON 1.1

     Drafting symbols

U+232D   ⌭   cylindricity So ON 1.1
sgml &cylcty;
U+232E   ⌮   all around profile So ON 1.1
sgml &profalar;
U+232F   ⌯   symmetry So ON 1.1
U+2330   ⌰   total runout So ON 1.1
U+2331   ⌱   dimension origin So ON 1.1
U+2332   ⌲   conical taper So ON 1.1
U+2333   ⌳   slope So ON 1.1
ref U+25FA   ◺   lower left triangle (Geometric Shapes)
U+2334   ⌴   counterbore So ON 1.1
ref U+2423   ␣   open box (Control Pictures)
U+2335   ⌵   countersink So ON 1.1
ref U+2304   ⌄   down arrowhead (Miscellaneous Technical)

     APL

U+2336   ⌶   APL functional symbol i beam So L 1.1
sgml &topbot;
U+2337   ⌷   APL functional symbol squish quad So L 1.1
ref U+2395   ⎕   APL functional symbol quad (Miscellaneous Technical)
ref U+25AF   ▯   white vertical rectangle (Geometric Shapes)
ref U+2AFF   ⫿   n ary white vertical bar (Supplemental Mathematical Operators)
U+2338   ⌸   APL functional symbol quad equal So L 1.1
U+2339   ⌹   APL functional symbol quad divide So L 1.1
U+233A   ⌺   APL functional symbol quad diamond So L 1.1
U+233B   ⌻   APL functional symbol quad jot So L 1.1
ref U+29C7   ⧇   squared small circle (Miscellaneous Mathematical Symbols B)
U+233C   ⌼   APL functional symbol quad circle So L 1.1
U+233D   ⌽   APL functional symbol circle stile So L 1.1
sgml &ovbar;
U+233E   ⌾   APL functional symbol circle jot So L 1.1
ref U+229A   ⊚   circled ring operator (Mathematical Operators)
ref U+29BE   ⦾   circled white bullet (Miscellaneous Mathematical Symbols B)
U+233F   ⌿   APL functional symbol slash bar So L 1.1
sgml &solbar;
ref U+1019A   𐆚   Roman as sign (Ancient Symbols)
U+2340   ⍀   APL functional symbol backslash bar So L 1.1
ref U+29F7   ⧷   reverse solidus with horizontal stroke (Miscellaneous Mathematical Symbols B)
U+2341   ⍁   APL functional symbol quad slash So L 1.1
ref U+29C4   ⧄   squared rising diagonal slash (Miscellaneous Mathematical Symbols B)
U+2342   ⍂   APL functional symbol quad backslash So L 1.1
ref U+29C5   ⧅   squared falling diagonal slash (Miscellaneous Mathematical Symbols B)
U+2343   ⍃   APL functional symbol quad less than So L 1.1
U+2344   ⍄   APL functional symbol quad greater than So L 1.1
U+2345   ⍅   APL functional symbol leftwards vane So L 1.1
U+2346   ⍆   APL functional symbol rightwards vane So L 1.1
U+2347   ⍇   APL functional symbol quad leftwards arrow So L 1.1
U+2348   ⍈   APL functional symbol quad rightwards arrow So L 1.1
U+2349   ⍉   APL functional symbol circle backslash So L 1.1
ref U+29B0   ⦰   reversed empty set (Miscellaneous Mathematical Symbols B)
U+234A   ⍊   APL functional symbol down tack underbar So L 1.1
aka up tack underbar
* preferred naming for APL tack symbols now follows the London Convention in ISO/IEC 13751:2000 (APL Extended)
ref U+22A5   ⊥   up tack (Mathematical Operators)
U+234B   ⍋   APL functional symbol delta stile So L 1.1
U+234C   ⍌   APL functional symbol quad down caret So L 1.1
U+234D   ⍍   APL functional symbol quad delta So L 1.1
U+234E   ⍎   APL functional symbol down tack jot So L 1.1
aka up tack jot
ref U+22A5   ⊥   up tack (Mathematical Operators)
U+234F   ⍏   APL functional symbol upwards vane So L 1.1
U+2350   ⍐   APL functional symbol quad upwards arrow So L 1.1
U+2351   ⍑   APL functional symbol up tack overbar So L 1.1
aka down tack overbar
ref U+22A4   ⊤   down tack (Mathematical Operators)
ref U+3012   〒   postal mark (CJK Symbols and Punctuation)
U+2352   ⍒   APL functional symbol del stile So L 1.1
U+2353   ⍓   APL functional symbol quad up caret So L 1.1
U+2354   ⍔   APL functional symbol quad del So L 1.1
U+2355   ⍕   APL functional symbol up tack jot So L 1.1
aka down tack jot
ref U+22A4   ⊤   down tack (Mathematical Operators)
U+2356   ⍖   APL functional symbol downwards vane So L 1.1
U+2357   ⍗   APL functional symbol quad downwards arrow So L 1.1
U+2358   ⍘   APL functional symbol quote underbar So L 1.1
U+2359   ⍙   APL functional symbol delta underbar So L 1.1
U+235A   ⍚   APL functional symbol diamond underbar So L 1.1
U+235B   ⍛   APL functional symbol jot underbar So L 1.1
U+235C   ⍜   APL functional symbol circle underbar So L 1.1
U+235D   ⍝   APL functional symbol up shoe jot So L 1.1
ref U+2A40   ⩀   intersection with dot (Supplemental Mathematical Operators)
U+235E   ⍞   APL functional symbol quote quad So L 1.1
U+235F   ⍟   APL functional symbol circle star So L 1.1
ref U+229B   ⊛   circled asterisk operator (Mathematical Operators)
U+2360   ⍠   APL functional symbol quad colon So L 1.1
U+2361   ⍡   APL functional symbol up tack diaeresis So L 1.1
aka down tack diaeresis
ref U+22A4   ⊤   down tack (Mathematical Operators)
U+2362   ⍢   APL functional symbol del diaeresis So L 1.1
U+2363   ⍣   APL functional symbol star diaeresis So L 1.1
U+2364   ⍤   APL functional symbol jot diaeresis So L 1.1
aka hoot
U+2365   ⍥   APL functional symbol circle diaeresis So L 1.1
aka holler
U+2366   ⍦   APL functional symbol down shoe stile So L 1.1
U+2367   ⍧   APL functional symbol left shoe stile So L 1.1
U+2368   ⍨   APL functional symbol tilde diaeresis So L 1.1
aka smirk
U+2369   ⍩   APL functional symbol greater than diaeresis So L 1.1
U+236A   ⍪   APL functional symbol comma bar So L 1.1
U+236B   ⍫   APL functional symbol del tilde So L 1.1
U+236C   ⍬   APL functional symbol zilde So L 1.1
U+236D   ⍭   APL functional symbol stile tilde So L 1.1
U+236E   ⍮   APL functional symbol semicolon underbar So L 1.1
U+236F   ⍯   APL functional symbol quad not equal So L 1.1
U+2370   ⍰   APL functional symbol quad question So L 1.1
U+2371   ⍱   APL functional symbol down caret tilde So L 1.1
U+2372   ⍲   APL functional symbol up caret tilde So L 1.1
U+2373   ⍳   APL functional symbol iota So L 1.1
U+2374   ⍴   APL functional symbol rho So L 1.1
U+2375   ⍵   APL functional symbol omega So L 1.1
U+2376   ⍶   APL functional symbol alpha underbar So L 1.1
U+2377   ⍷   APL functional symbol epsilon underbar So L 1.1
U+2378   ⍸   APL functional symbol iota underbar So L 1.1
U+2379   ⍹   APL functional symbol omega underbar So L 1.1
U+237A   ⍺   APL functional symbol alpha So L 1.1

     Graphics for control codes

U+237B   ⍻   not check mark So ON 3.0
* from ISO 2047
* symbol for Negative Acknowledge

     Miscellaneous technical

U+237C   ⍼   right angle with downwards zigzag arrow Sm ON 3.2
sgml &angzarr;

     Graphics for control codes

U+237D   ⍽   shouldered open box So ON 3.0
* from ISO 9995-7
* keyboard symbol for No Break Space
ref U+2423   ␣   open box (Control Pictures)
U+237E   ⍾   bell symbol So ON 3.0
* from ISO 2047
U+237F   ⍿   vertical line with middle dot So ON 3.0
* from ISO 2047
* symbol for End of Medium

     Keyboard symbols from ISO 9995-7

U+2380   ⎀   insertion symbol So ON 3.0
U+2381   ⎁   continuous underline symbol So ON 3.0
U+2382   ⎂   discontinuous underline symbol So ON 3.0
U+2383   ⎃   emphasis symbol So ON 3.0
U+2384   ⎄   composition symbol So ON 3.0
U+2385   ⎅   white square with centre vertical line So ON 3.0
aka center
U+2386   ⎆   enter symbol So ON 3.0
U+2387   ⎇   alternative key symbol So ON 3.0
U+2388   ⎈   helm symbol So ON 3.0
aka control
ref U+2638   ☸   wheel of dharma (Miscellaneous Symbols)
U+2389   ⎉   circled horizontal bar with notch So ON 3.0
aka pause
U+238A   ⎊   circled triangle down So ON 3.0
aka interrupt
U+238B   ⎋   broken circle with northwest arrow So ON 3.0
aka escape
U+238C   ⎌   undo symbol So ON 3.0

     Electrotechnical symbols from IR 181

U+238D   ⎍   monostable symbol So ON 3.0
U+238E   ⎎   hysteresis symbol So ON 3.0
U+238F   ⎏   open circuit output h type symbol So ON 3.0
U+2390   ⎐   open circuit output l type symbol So ON 3.0
U+2391   ⎑   passive pull down output symbol So ON 3.0
U+2392   ⎒   passive pull up output symbol So ON 3.0
U+2393   ⎓   direct current symbol form two So ON 3.0
U+2394   ⎔   software function symbol So ON 3.0

     APL

U+2395   ⎕   APL functional symbol quad So L 3.0
ref U+2337   ⌷   APL functional symbol squish quad (Miscellaneous Technical)
ref U+25AF   ▯   white vertical rectangle (Geometric Shapes)

     Keyboard symbols from ISO 9995-7

U+2396   ⎖   decimal separator key symbol So ON 3.0
U+2397   ⎗   previous page So ON 3.0
U+2398   ⎘   next page So ON 3.0
U+2399   ⎙   print screen symbol So ON 3.0
U+239A   ⎚   clear screen symbol So ON 3.0
ref U+20E2   ⃢   combining enclosing screen (Combining Diacritical Marks for Symbols)

     Bracket pieces

U+239B   ⎛   left parenthesis upper hook Sm ON 3.2
U+239C   ⎜   left parenthesis extension Sm ON 3.2
U+239D   ⎝   left parenthesis lower hook Sm ON 3.2
U+239E   ⎞   right parenthesis upper hook Sm ON 3.2
U+239F   ⎟   right parenthesis extension Sm ON 3.2
U+23A0   ⎠   right parenthesis lower hook Sm ON 3.2
U+23A1   ⎡   left square bracket upper corner Sm ON 3.2
U+23A2   ⎢   left square bracket extension Sm ON 3.2
U+23A3   ⎣   left square bracket lower corner Sm ON 3.2
U+23A4   ⎤   right square bracket upper corner Sm ON 3.2
U+23A5   ⎥   right square bracket extension Sm ON 3.2
U+23A6   ⎦   right square bracket lower corner Sm ON 3.2
U+23A7   ⎧   left curly bracket upper hook Sm ON 3.2
U+23A8   ⎨   left curly bracket middle piece Sm ON 3.2
U+23A9   ⎩   left curly bracket lower hook Sm ON 3.2
U+23AA   ⎪   curly bracket extension Sm ON 3.2
U+23AB   ⎫   right curly bracket upper hook Sm ON 3.2
U+23AC   ⎬   right curly bracket middle piece Sm ON 3.2
U+23AD   ⎭   right curly bracket lower hook Sm ON 3.2

     Special character extensions

U+23AE   ⎮   integral extension Sm ON 3.2
ref U+2320   ⌠   top half integral (Miscellaneous Technical)
ref U+2321   ⌡   bottom half integral (Miscellaneous Technical)
U+23AF   ⎯   horizontal line extension Sm ON 3.2
* used for extension of arrows
ref U+23D0   ⏐   vertical line extension (Miscellaneous Technical)

     Bracket pieces

U+23B0   ⎰   upper left or lower right curly bracket section Sm ON 3.2
sgml &lmoust;
aka left moustache
U+23B1   ⎱   upper right or lower left curly bracket section Sm ON 3.2
sgml &rmoust;
aka right moustache

     Summation sign parts

U+23B2   ⎲   summation top Sm ON 3.2
U+23B3   ⎳   summation bottom Sm ON 3.2

     Horizontal brackets
These characters are also used as delimiters of vertical text in non-CJK terminal emulation.

U+23B4   ⎴   top square bracket So ON 3.2
sgml &tbrk;
ref U+FE47   ﹇   presentation form for vertical left square bracket (CJK Compatibility Forms)
U+23B5   ⎵   bottom square bracket So ON 3.2
sgml &bbrk;
ref U+FE48   ﹈   presentation form for vertical right square bracket (CJK Compatibility Forms)
U+23B6   ⎶   bottom square bracket over top square bracket So ON 3.2
* only used for terminal emulation

     Terminal graphic characters

U+23B7   ⎷   radical symbol bottom So ON 3.2
U+23B8   ⎸   left vertical box line So ON 3.2
U+23B9   ⎹   right vertical box line So ON 3.2

     Scan lines for terminal graphics
The scan line numbers here refer to old, low-resolution technology for terminals, with only 9 scan lines per fixed-size character glyph. Even-numbered scan lines are unified with box-drawing graphics.

U+23BA   ⎺   horizontal scan line 1 So ON 3.2
U+23BB   ⎻   horizontal scan line 3 So ON 3.2
U+23BC   ⎼   horizontal scan line 7 So ON 3.2
U+23BD   ⎽   horizontal scan line 9 So ON 3.2

     Dentistry notation symbols

U+23BE   ⎾   dentistry symbol light vertical and top right So ON 3.2
ref U+2308   ⌈   left ceiling (Miscellaneous Technical)
U+23BF   ⎿   dentistry symbol light vertical and bottom right So ON 3.2
ref U+230A   ⌊   left floor (Miscellaneous Technical)
U+23C0   ⏀   dentistry symbol light vertical with circle So ON 3.2
U+23C1   ⏁   dentistry symbol light down and horizontal with circle So ON 3.2
U+23C2   ⏂   dentistry symbol light up and horizontal with circle So ON 3.2
U+23C3   ⏃   dentistry symbol light vertical with triangle So ON 3.2
U+23C4   ⏄   dentistry symbol light down and horizontal with triangle So ON 3.2
U+23C5   ⏅   dentistry symbol light up and horizontal with triangle So ON 3.2
U+23C6   ⏆   dentistry symbol light vertical and wave So ON 3.2
U+23C7   ⏇   dentistry symbol light down and horizontal with wave So ON 3.2
U+23C8   ⏈   dentistry symbol light up and horizontal with wave So ON 3.2
U+23C9   ⏉   dentistry symbol light down and horizontal So ON 3.2
ref U+22A4   ⊤   down tack (Mathematical Operators)
ref U+252C   ┬   box drawings light down and horizontal (Box Drawing)
U+23CA   ⏊   dentistry symbol light up and horizontal So ON 3.2
ref U+22A5   ⊥   up tack (Mathematical Operators)
ref U+2534   ┴   box drawings light up and horizontal (Box Drawing)
U+23CB   ⏋   dentistry symbol light vertical and top left So ON 3.2
ref U+2309   ⌉   right ceiling (Miscellaneous Technical)
U+23CC   ⏌   dentistry symbol light vertical and bottom left So ON 3.2
ref U+230B   ⌋   right floor (Miscellaneous Technical)

     Miscellaneous technical

U+23CD   ⏍   square foot So ON 3.2

     Keyboard and UI symbols

U+23CE   ⏎   return symbol So ON 3.2
* may be shown with either hollow or filled glyph
ref U+21B5   ↵   downwards arrow with corner leftwards (Arrows)
U+23CF   ⏏   eject symbol So ON 4.0
* UI symbol to eject media

     Special character extension

U+23D0   ⏐   vertical line extension So ON 4.0
* used for extension of arrows
ref U+23AF   ⎯   horizontal line extension (Miscellaneous Technical)

     Metrical symbols

U+23D1   ⏑   metrical breve So ON 4.1
U+23D2   ⏒   metrical long over short So ON 4.1
U+23D3   ⏓   metrical short over long So ON 4.1
U+23D4   ⏔   metrical long over two shorts So ON 4.1
U+23D5   ⏕   metrical two shorts over long So ON 4.1
U+23D6   ⏖   metrical two shorts joined So ON 4.1
U+23D7   ⏗   metrical triseme So ON 4.1
ref U+1D242   𝉂   combining Greek musical triseme (Ancient Greek Musical Notation)
U+23D8   ⏘   metrical tetraseme So ON 4.1
ref U+1D243   𝉃   combining Greek musical tetraseme (Ancient Greek Musical Notation)
U+23D9   ⏙   metrical pentaseme So ON 4.1
ref U+1D244   𝉄   combining Greek musical pentaseme (Ancient Greek Musical Notation)

     Electrotechnical symbols

U+23DA   ⏚   earth ground So ON 4.1
U+23DB   ⏛   fuse So ON 4.1

     Horizontal brackets
These are intended for bracketing terms of mathematical expressions where their glyph extends to accommodate the width of the bracketed expression

U+23DC   ⏜   top parenthesis Sm ON 5.0
ref U+FE35   ︵   presentation form for vertical left parenthesis (CJK Compatibility Forms)
U+23DD   ⏝   bottom parenthesis Sm ON 5.0
ref U+FE36   ︶   presentation form for vertical right parenthesis (CJK Compatibility Forms)
U+23DE   ⏞   top curly bracket Sm ON 5.0
ref U+FE37   ︷   presentation form for vertical left curly bracket (CJK Compatibility Forms)
U+23DF   ⏟   bottom curly bracket Sm ON 5.0
ref U+FE38   ︸   presentation form for vertical right curly bracket (CJK Compatibility Forms)
U+23E0   ⏠   top tortoise shell bracket Sm ON 5.0
ref U+FE39   ︹   presentation form for vertical left tortoise shell bracket (CJK Compatibility Forms)
U+23E1   ⏡   bottom tortoise shell bracket Sm ON 5.0
ref U+FE3A   ︺   presentation form for vertical right tortoise shell bracket (CJK Compatibility Forms)

     Miscellaneous technical

U+23E2   ⏢   white trapezium So ON 5.0

     Chemistry symbol

U+23E3   ⏣   benzene ring with circle So ON 5.0

     Miscellaneous technical

U+23E4   ⏤   straightness So ON 5.0
U+23E5   ⏥   flatness So ON 5.0
U+23E6   ⏦   ac current So ON 5.0
U+23E7   ⏧   electrical intersection So ON 5.0

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