[pwdisswordfish8]

U+005C is REVERSE SOLIDUS, it always has been.

[divingdragon]

Yes in theory, but in practice some Japanese fonts use the yen sign glyph for U+005C, the most common ones being those that come with Windows.

[fomine3]

I wish it was before Unicode.

[RedNifre]

There is no "U+" before Unicode, what would that even mean? Unicode before Unicode?

[fomine3]

0x5C in ascii compatible Japanese charsets