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The mathabx package provides a square version of \subset (namely \sqsubset). However I don't think there is a square version of \in. Does anyone know of one? If not, what is the best way to create it?

Randy Randerson
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  • For my opinion it not exist, but you colud create a personal symbol using for example withtikz. – Sebastiano Mar 21 '18 at 07:48
  • The duplicate is from 2013, and the accepted answer is either incomplete or out of date as of 2018. This operator is now in Unicode and several common packages. – Davislor Mar 21 '18 at 10:15

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Yes. ⋿ is Unicode character U+22FF, Z-notation bag membership. You can \usepackage{unicode-math} and paste it in. The package also declares it as \bagmember. It has the spacing of a relational operator.

The stix package likewise declares this symbol as \bagmember, but I highly recommend you use unicode-math wherever you can. It has far better coverage, superior ability to add or substitute glyphs, and compatibility with modern fonts and technologies. As a bonus, you can copy, paste and search for symbols in both the source file and the PDF.

Davislor
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