xref
= X =
xyzzy
XXX /X-X-X/ n.
A marker that attention is needed.
Commonly used in program comments to indicate areas that are kluged
up or need to be. Some hackers liken `XXX' to the notional
heavy-porn movie rating. Compare FIXME.
--The Jargon File version 4.3.1, ed. ESR, autonoded by rescdsk.