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Japanese is romanised as Hepburn. Kanji entry would be impossible without tongpoo's Unicode converter
Gai-on (外音) are a new development in written Japanese that has only appeared in the past fifteen years or so. It is
kanji that is used to represent a borrowed foreign word (almost inevitably English). Perhaps this can be considered a logical extension of the way that kanji has always been used by the Japanese, but it does not fit into the traditional schemes of
kun-yomi,
on-yomi,
ateji or
gikun.
An example is 高技: the reading you would expect is either kōgi (on-yomi) or takawaza (kun-yomi). The actual reading is hai-teku...or 'high-tech'!