Similar to トライグラフ

Extended Unix Code

Gaiji

Extended ASCII

Whitespace character

Combining character

Code page

Japanese script reform

Currency sign (generic)

Mojikyō

CJK

CJK Unified Ideographs

Four-corner method

Glyph

Shift JIS

Graphic character

Control character

Halfwidth and fullwidth forms

Spelling alphabet

Text file

Chinese telegraph code

Null character

Percent-encoding