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. That standard is named "Information technology — Keyboard layouts for text and office systems — Part 7: Symbols used to represent functions". In that standard, the symbol is named "Undo" and described "To return to the state prior to that of the last executed action". There, the symbol appears in this form: 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: The glyph in the current Unicode charts (Version 16.0): 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. (I will file a glyph correction request within the next days.) Best wishes Karl Pentzlin -- Am Samstag, 14. Juni 2025 um 20:47 schrieb Markus Scherer via Unicode:
> On Sat, Jun 14, 2025 at 11:19 AM Jukka K. Korpela via Unicode < > [email protected]> wrote: >> I would first ask why UNDO SYMBOL was included > It was encoded in 1998 in ISO 10646 Amendment 22 Keyboard Symbols, and then > published in 1999 in Unicode 3.0. > The first documents about "keyboard symbols" appear in 1997: > https://www.unicode.org/L2/L1997/Register-1997.html > https://www.unicode.org/L2/L1998/Register-1998.html > https://www.unicode.org/wg2/docs/n2100.htm > Many of these documents were on paper and don't have online versions. > In general, user interfaces do just fine with symbols as images, not > needing encoded characters, and not wanting to rely on variable font > support and glyph design. > markus
