### Monotype Mathematical Sorts

*
Part 1: U+237C ⍼ RIGHT ANGLE WITH DOWNWARDS ZIGZAG ARROW
Part 2: update: U+237C ⍼ angzarr;
Many thanks to Alicia Chilcott and Sophie Hawkey-Edwards at St Bride for their help.
*

Part 2: update: U+237C ⍼ angzarr;

Many thanks to Alicia Chilcott and Sophie Hawkey-Edwards at St Bride for their help.

*This post is a continuation of the investigation into
U+237C ⍼ RIGHT ANGLE WITH DOWNWARDS ZIGZAG ARROW.
For new photos of relevant documents held at St Bride Library, see Monotype Mathematical Sorts.
Many thanks to Barbara Beeton, James David Mason, Anders Berglund, David Bolton, Andy Whyte,
Claire Welford-Elkin, and Bob Richardson.*

*For updates on the hunt for ⍼, see the new post.*

Known as right angle with downwards zigzag arrow,
angle with down zig-zag arrow,
`\rangledownzigzagarrow`

,
and `⍼`

,
no one knows what ⍼ is meant to represent or where it originated from.
Section 22.7 Technical Symbols
from the Unicode Standard on the
Miscellaneous Technical block
doesn’t say anything about it.

The Unicode Standard has its fair share of mysterious and sometimes unexplained characters. The story of the Farsi symbol (U+262B ☫ farsi symbol) is one of the more well-known ones. Many blocks, especially the “miscellaneous” blocks, have smatterings of rather arbitrary character sets grouped together only by history. One such block is Miscellaneous Technical, which contains completely unrelated groups of characters, including keyboard symbols, APL symbols, electrotechnical symbols, UI symbols, drafting symbols, and of particular interest in this blog post, dentistry notation symbols. Here they are, all 15 of them:

```
⎾⎿⏀⏁⏂⏃⏄⏅⏆⏇⏈⏉⏊⏋⏌
```

The first two and last two are part of Palmer notation for denoting human teeth by their position. What are the rest for?

More …