CODEWITHSUNDEEP
unicode
Justin L.
Justin L.

Reputation: 4147

Why is there no leftward-pointing equivalent of unicode "Arrow pointing rightwards then curving upwards"?

AFAICT from http://unicode-table.com/en/sets/arrows-symbols/, there's no left-and-upwards equivalent of unicode Arrow pointing rightwards then curving upwards (⤴).

This can of course be simulated by reversing the glyph. But then Arrow pointing downwards then curving leftwards (⤶) and Arrow pointing downwards then curving rightwards (⤷) are mirror images of each other, and they both exist.

What's the rationale behind this?

Upvotes: 5

Views: 2325

Answers (1)

Karol S
Karol S

Reputation: 9402

⤴ and ⤵ were added for compatibility with JIS X 0213:2000:

http://www.unicode.org/L2/L2000/00024.pdf

http://www.unicode.org/L2/L2000/00298-n2258.pdf

http://examples.oreilly.com/cjkvinfo/pdf/jisx0208+0213.pdf (see row 0x82)

The original names for ⤴ and ⤵ (RISING ARROW and FALLING ARROW) explain their suggested use.

⤶ and ⤷ were added for compatibility with STIX font family, often used for mathematical typesetting in TeX. Here is the original proposal: http://www.unicode.org/L2/L1999/99244.pdf

All four curving arrows were added to Unicode 3.2 in 2002. The fact that those two pairs got added at the same time is mostly accidental.

Upvotes: 3

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