The ISO Latin 1 character repertoire – a description with usage notes, section 3 The characters grouped by type, with annotations:

Mathematical, logical and physical symbols

%percent sign
+plus sign
<less-than sign
>greater-than sign
=equals sign
not sign
multiplication sign
division sign
degree sign
micro sign


A Brief History of the Notation of Boole's Algebra by Michael Schroeder contains, in section Algebraic Notation, information on the history of some mathematical symbols.

Originally created 2000-03-31. Structurally changed 2018-10-16. Minor modifications 2018-12-15.
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