Quick answer
Only the plus-minus, multiplication, and division signs have a legacy Alt code (they're in Latin-1); every other math operator below — infinity, integral, summation, square root — needs the universal hex method.
01 Alt codes at a glance
| Character | Windows Alt code | Universal (any codepoint) | Mac | HTML |
|---|---|---|---|---|
| N-ary Summation | — none — | Alt+X after typing 2211 (Word) · Ctrl+Shift+U then 2211 (Linux) |
Character page → | |
| Plus-minus Sign | Alt+0177 |
Alt+X after typing 00B1 (Word) · Ctrl+Shift+U then 00b1 (Linux) |
Character page → | |
| Division Sign | Alt+0247 |
Alt+X after typing 00F7 (Word) · Ctrl+Shift+U then 00f7 (Linux) |
Character page → | |
| Multiplication Sign | Alt+0215 |
Alt+X after typing 00D7 (Word) · Ctrl+Shift+U then 00d7 (Linux) |
Character page → | |
| Not Equal To | — none — | Alt+X after typing 2260 (Word) · Ctrl+Shift+U then 2260 (Linux) |
Character page → | |
| Square Root | — none — | Alt+X after typing 221A (Word) · Ctrl+Shift+U then 221a (Linux) |
Character page → | |
| Infinity | — none — | Alt+X after typing 221E (Word) · Ctrl+Shift+U then 221e (Linux) |
Character page → | |
| Integral | — none — | Alt+X after typing 222B (Word) · Ctrl+Shift+U then 222b (Linux) |
Character page → | |
| Therefore | — none — | Alt+X after typing 2234 (Word) · Ctrl+Shift+U then 2234 (Linux) |
Character page → | |
| Almost Equal To | — none — | Alt+X after typing 2248 (Word) · Ctrl+Shift+U then 2248 (Linux) |
Character page → | |
| Less-than Or Equal To | — none — | Alt+X after typing 2264 (Word) · Ctrl+Shift+U then 2264 (Linux) |
Character page → | |
| Greater-than Or Equal To | — none — | Alt+X after typing 2265 (Word) · Ctrl+Shift+U then 2265 (Linux) |
Character page → |
3 of 12 characters here have a legacy Windows Alt+NNNN code — that code only exists for the Latin-1 Supplement range and Windows-1252's fixed special-character block, not for Unicode generally. Every character has the universal hex-based method though: type the hex codepoint, then press Alt+X in Word to convert it.
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