What ⧇ means
Read it by the rules of its own notation.
The formula or software defines its role; the circle inside the square does not name an operation on its own.
Unicode cross-references ⧇ to ⌻, a separate character used in APL, a programming language for arrays and matrices. In APL, ⌻ is a matrix operator; the two characters are not interchangeable. Mathematical fonts may position specialist operators differently; if ⧇ is missing, check the font's math-symbol coverage.
This is specialist mathematical or programming notation.
Do not infer an operation from the shape alone.
Don't confuse it with
4Questions people ask
1Why does ⧇ show as a box on some devices?
Because that device's fonts have no glyph for it. The character is still correct and still copies correctly — the box is a missing glyph, not a broken character.
How to type ⧇
⧇\29C7Codes and encoding1 code points
A visible symbol can contain several code points. JS .length counts UTF-16 units; UTF-8 counts bytes.