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</style></head><body><p class="norm">The symbol U+238C UNDO SYMBOL is the symbol #30 from the standard ISO/IEC 9995-7 in its editions at least since the 1990s.</p><p class="norm">That standard is named "Information technology — Keyboard layouts for text and office systems —</p><p class="norm">Part 7: Symbols used to represent functions".</p><p class="norm">In that standard, the symbol is named "Undo" and described "To return to the state prior to that of the last executed action".</p><p class="norm">There, the symbol appears in this form:</p><p><img src="cid:414325387.png"/> </p><p class="norm"></p><p class="norm"> </p><p>It is also contained in ISO 7000 "Graphical symbols for use on equipment" as symbol #2106, with name "Undo", description "To identify the control that deletes the most recently taken action and returns the document to its immediately preceding status." and release date 2004-01-15:</p><p><img src="cid:2040513729.png"/></p><p class="norm"> </p><p class="norm">The glyph in the current Unicode charts (Version 16.0):</p><p><img src="cid:838227940.png"/> </p><p>is erroneous, as the right circle is not filled and therefore not distinctive from the left circle, as it obviously was intended in the original symbol design.</p><p>(I will file a glyph correction request within the next days.)</p><p> </p><p>Best wishes</p><p>Karl Pentzlin</p><p class="norm"> </p><p class="norm"> </p><p class="norm">--</p><p class="norm">Am Samstag, 14. Juni 2025 um 20:47 schrieb Markus Scherer via Unicode:</p><p class="norm"><br/></p><blockquote class="quote-odd quote-text-odd rt" prefix="MSvU> ">On Sat, Jun 14, 2025 at 11:19 AM Jukka K. Korpela via Unicode <<br/>
<a class="HR" href="mailto:unicode@corp.unicode.org">unicode@corp.unicode.org</a>> wrote:</blockquote><p class="norm"><br/></p><blockquote class="quote-odd quote-text-odd rt" prefix=">"><blockquote class="quote-even quote-text-even rt" prefix=">> ">I would first ask why UNDO SYMBOL was included</blockquote><blockquote class="quote-even quote-text-even rt" prefix=">>"></blockquote></blockquote><p class="norm"><br/></p><blockquote class="quote-odd quote-text-odd rt" prefix="MSvU> ">It was encoded in 1998 in ISO 10646 Amendment 22 Keyboard Symbols, and then<br/>
published in 1999 in Unicode 3.0.<br/>
The first documents about "keyboard symbols" appear in 1997:<br/>
<a class="HR" href="https://www.unicode.org/L2/L1997/Register-1997.html">https://www.unicode.org/L2/L1997/Register-1997.html</a><br/>
<a class="HR" href="https://www.unicode.org/L2/L1998/Register-1998.html">https://www.unicode.org/L2/L1998/Register-1998.html</a><br/>
<a class="HR" href="https://www.unicode.org/wg2/docs/n2100.htm">https://www.unicode.org/wg2/docs/n2100.htm</a></blockquote><p class="norm"><br/></p><blockquote class="quote-odd quote-text-odd rt" prefix="MSvU> ">Many of these documents were on paper and don't have online versions.</blockquote><p class="norm"><br/></p><blockquote class="quote-odd quote-text-odd rt" prefix="MSvU> ">In general, user interfaces do just fine with symbols as images, not<br/>
needing encoded characters, and not wanting to rely on variable font<br/>
support and glyph design.</blockquote><p class="norm"><br/></p><blockquote class="quote-odd quote-text-odd rt" prefix="MSvU> ">markus</blockquote></body></html>