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    @AlanMunn -- asking you since you edited the question ... maybe "extend" the title to "how to look up a symbol or the style of a math alphabet"? many, many questions are about alphabet styles, not just other symbols, and this doesn't seem to be obvious. Commented Jun 5, 2013 at 12:59
  • Related: What are all the font styles I can use in math mode?
    – Werner
    Commented Dec 20, 2021 at 4:36
  • Note: ■ deTeXify only helps with finding symbol, not determining the font. So it cannot e.g. finding characters in commercial font, e.g. Adobe Minion Pro. See also: How do I find out what fonts are used in a document/picture? ■ deTeXify appears to use DTW as the algorithm and unfortunately currently is sensitive to both order of strokes and direction of strokes. (try look up . You need to draw it in order ○\/| and the needs to be drawn counter clockwise for the correct symbol to be shown on top.)
    – user202729
    Commented Aug 17, 2022 at 11:11