U+237C ⍼ Appropriate Attitude with Downwards Zigzag Arrow

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 original proposal that included this character…

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U+237C ⍼ Appropriate Attitude with Downwards Zigzag Arrow
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Is known as honorable-looking out angle with downwards zigzag arrow,
angle with down zig-zag arrow,
rangledownzigzagarrow,
and ⍼,
no person knows what ⍼ is meant to indicate or where it originated from.
Half 22.7 Technical Symbols
from the Unicode Usual on the
Miscellaneous Technical block
doesn’t assert anything else about it.

The distinctive proposal that incorporated this persona is
Proposal for Encoding Further Mathematical Symbols in the BMP (N2191)
from 14 March 2000, with origins from the
STIX mission.
That mission web say hyperlinks to a series of relevant recordsdata relationship your total design wait on to 1997,
and most importantly to the very first collation of
persona tables by Barbara Beeton
closing updated on 24 June 1997.
Here we gather that, in desk &ac-&cirmid
below codes with TR 9573 names, an entry for the persona.

AFII ISO TR9573 entity ISO TR9573 description
D97C ⍼ angle with down zig-zag arrow

(This desk is later merged into a larger desk.)
A desk from 18 July 1997
clarifies that these are characters from the technical epic TR 9573-13.
A later desk from 7 Feburary 1998
with accompanying glyphs confirms that right here’s indeed the persona we’re shopping for.

Unicode Glyph SGML Title Description
E248 angzarr ISOAMSA angle with down zig-zag arrow

The Unicode code level E248 is, for sure, no longer its present loyal code level.
That one is found in a Non-public Employ Home (PUA)
in the Frequent Multilingual Airplane (BMP), and so change into possible a non permanent encoding within STIX
earlier than acceptance into Unicode honest.
The AFII code level D97C will possible be explained later,
as will what AFII stands for and what it’s.

Linked is the Mathematical Markup Language (MathML) Specification:
Half 6.2.5.1 ISO Image Entity Items
provides the the same tables as STIX,
and our persona can again be uncover in team ISO AMS-A.

ISO/IEC TR 9573-13: 1991 and mates

The technical epic, whose long name is
ISO/IEC TR 9573-13: 1991 Ways for the exercise of SGML — Half 13: Public entity sets for mathematics and science,
change into printed in July 1991.
Even supposing their enviornment claims there change into by no design a extra recent version,
there might maybe be a epic with the the same name
closing updated on 8 December 2003.
It indeed lists U+237C in Half 7.1 isoamsa,
but evidently this got right here after it change into added to the Unicode Usual.

5.2.5 Arrow Relations

Entity name: angzarr
Characteristic glyph: ⍼
Registered glyph identifier (hexa-decimal): D97C
Registered glyph identifier (decimal): 55676
Short description: angle with down zig-zag arrow

Excerpt from ISO/IEC TR 9573-13: 1991, Half 5.2.5 Arrow Family

The particular tech epic itself doesn’t provide mighty extra records than the newer epic,
proven in the take above:
all it contains is its short name, the glyph, its veteran code level D97C, and a description.
(Whereas you happen to’re a UBC student or school, you would additionally get entry to the
tech epic by Techstreet
or right here.)
Basically the most efficient other reference is uncover in Half 6.2.5 Arrow Family,
which supplies the the same entity listings as
ISOasma.ent
in the Debian kit sgml-records.
The Foreword, despite the truth that, mentions that this tech epic replaces an earlier annex.

h) Half 13 replaces ISO 8879: 1986 annex D (in allotment)

Having a peek at ISO/IEC TR 9573: 1988 Ways for the exercise of SGML as well,
which of us at UBC might maybe maybe additionally also entry by CSA onDemand
as CAN/CSA-Z243.210.1-89 (R2018),
it also means that the symbols it uses comes from ISO 8879.

8.3 Symbols

One of the difficulties in describing mathematics is caused by the extensive use of special
symbols, normally not available on computer keyboards. This application uses the entity references in annex D of ISO 8879 to solve this problem.

Excerpt from ISO/IEC TR 9573: 1988, Half 8.3 Symbols

However, this Annex D of ISO 8879: 1986 Usual Generalized Markup Language (SGML)
(which UBC of us can again entry as
CAN/CSA-Z243.210-89 (R2014)
by CSA onDemand)
doesn’t have our persona, neither below ISO ASM-A as expected, nor wherever else.

D.4.5.5 Arrow Family

<!-- (C) International Organization for Standardization 1986
     Permission to copy in any form is granted for use with
     confirming SGML systems and applications as defined in
     ISO 8879, provided this notice is included in all copies.
--/>
<!-- Persona entity location. Conventional invocation:
     <!ENTITY % ISOamsa PUBLIC

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“Simplicity, patience, compassion.
These three are your greatest treasures.
Simple in actions and thoughts, you return to the source of being.
Patient with both friends and enemies,
you accord with the way things are.
Compassionate toward yourself,
you reconcile all beings in the world.”
― Lao Tzu, Tao Te Ching
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