Math Symbols Symbols & Their Meanings

16 math symbols symbols explained — meaning, origin, spiritual significance, and how each one is used today.

Angle Symbol (∠) — marks the angle at a vertex in geometry.

The Congruent Symbol (≅): same shape AND same size — geometry’s way of saying two figures are identical in all b…

Element Of Symbol (∈) — membership — x ∈ A reads "x belongs to set A", from the Greek epsilon.

The Empty Set Symbol (∅): the set with nothing in it — zero as a collection, from the Norwegian/Danish letter Ø.

For All Symbol (∀) — the upside-down A — "for every" in logic: every member of the set obeys the statement.

Infinity Symbol (∞) — the lemniscate — a quantity without bound, introduced by John Wallis in 1655.

The Integral Symbol (∫): an elongated S (for summa) — adds up infinitely many infinitely small pieces to find ar…

Nabla / Del Symbol (∇) — the upside-down triangle of vector calculus — gradient, divergence, and curl all speak …

The Not Equal Sign (≠): the equals sign slashed — the two sides are definitively different.

Partial Derivative Symbol (∂) — the curly d — derivative with respect to one variable while the others hold still.

The Pi Symbol (π): the circle constant 3.14159… — circumference over diameter, irrational and patternless, celeb…

Plus-Minus Sign (±) — both answers at once: the value could be the number added or subtracted — famous from quad…

Proportional To Symbol (∝) — "varies with" — when one quantity grows, the other grows with it.

The Square Root Symbol (√): the number that, multiplied by itself, gives the value under the sign — the radical …

Summation Symbol (∑) — add up a series — capital sigma instructing you to sum everything from the index below to…

The There Exists Symbol (∃): the reversed E — "at least one exists": somewhere in the set, the statement holds.