The following tables are extracted from The Not So Short Introduction to LaTeX2e, aka. LaTeX2e in 90 minutes, by Tobias Oetiker, Hubert Partl, Irene Hyna, and Elisabeth Schlegl. It can be located here.
Table: Math Mode Accents

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Table: Lowercase Greek Letters

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Table: Uppercase Greek Letters

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Table: Binary Relations
You can produce corresponding negations by adding a \not command as prefix to the following symbols.

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$^a$ Use the latexsym
package to access this symbol
Table: Binary Operators

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$^a$ Use the latexsym
package to access this symbol
Table: BIG Operators

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Table: Arrows

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$^a$ Use the latexsym
package to access this symbol
Table: Delimiters

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Table: Miscellaneous Symbols

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$^a$ Use the latexsym
package to access this symbol
Table: Non-Mathematical Symbols
These symbols can also be used in text mode.

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Table: AMS Delimiters

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Table: AMS Binary Relations

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Table: AMS Arrows

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Table: AMS Negated Binary Relations and Arrows

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Table: AMS Binary Operators

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Table: AMS Miscellaneous

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Table: Math Alphabets

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Reprinted with permission from LaTeX Math Symbols