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Symbol Name, arcsecond, , line segment, perpendicular, parallel, , congruent to, similarity, , triangle, , distance, , pi constant, , radians, , grads, , x variable, equivalence, , equal by definition, equal by definition, approximately equal, approximately equal, , symbol, ®, <, >, O, o, (), xt, Ix], F(x), (Fes), (ab), [ab], , aMuMe pe, , Symbol Name, proportional to, lemniscate, , much less than, much greater than, parentheses, brackets, , braces, exclamation mark, single vertical bar, function of x, function composition, open interval, closed interval, delta, , discriminant, sigma, , sigma, , capital pi