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mathematical symbol
Quantitative symbol

Such as: I, 2+i, A, X, natural logarithm base E, pi.

Operation symbol

Such as plus sign (+), minus sign (-), multiplication sign (× or), division sign (÷ or/), union of two sets (∩), intersection (∩), root sign (√), logarithm (log, lg, ln) and ratio (:).

Relational character

For example, = is equal sign, ≈ is approximate sign, ≠ is unequal sign, > is greater than sign, > is far greater than sign.

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