ALT Codes

This is a collection of alt-codes I've found useful for scientific writing.  You can type these by holding down Alt and typing the number using the number pad (different from the normal top-line number keys).  The html equivalent is also given.

ALT Code HTML Code Symbol Description
247 Approximately equal to
240 Identical to
8800 Not equal to
241 ± ± Plus or minus
227 π π Pi
248 ° ° Degree symbol
236 Infinity
230 µ µ Micro (10^-6)
228 Σ Σ

Sigma (Summutation)

234 Ω Ω Omega (Ohms)
127 ? ? Delta