Math symbols to copy and paste

Mathematical notation predates keyboards by centuries, and most of it never made it onto them. This collection covers the operators, comparisons and set symbols people actually need in documents, from plus-minus to infinity.

For serious typesetting use MathML or LaTeX; for a tweet, a slide or a spec, pasting the right character beats a clumsy ASCII approximation. Every entry notes its common misuses — multiplication sign versus the letter x is the classic.