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+	Plus: add		math-symbols
−	Minus: subtract		math-symbols
×	Times: multiply		math-symbols
÷	Divided by: divide		math-symbols
=	Equals: is the same value as		math-symbols
≠	Is not equal to		math-symbols
<	Is less than		math-symbols
>	Is greater than		math-symbols
≤	Is less than or equal to		math-symbols
≥	Is greater than or equal to		math-symbols
≈	Is approximately equal to		math-symbols
≡	Is identical to or congruent (mod) to		math-symbols
±	Plus or minus		math-symbols
∓	Minus or plus		math-symbols
√	Square root (radical)		math-symbols
∛	Cube root		math-symbols
π	Pi: about 3.14159, circumference over diameter		math-symbols
∞	Infinity: unbounded, without end		math-symbols
%	Percent: out of 100		math-symbols
‰	Per mille: out of 1,000		math-symbols
°	Degree: a unit of angle or temperature		math-symbols
′	Prime: minutes, feet, or a related variable		math-symbols
″	Double prime: seconds, inches		math-symbols
|x|	Absolute value of x		math-symbols
!	Factorial		math-symbols
Σ	Sigma: sum of a series		math-symbols
Π (capital pi)	Product of a series		math-symbols
Δ	Delta: change in		math-symbols
∂	Partial derivative		math-symbols
∫	Integral		math-symbols
∮	Contour or closed-loop integral		math-symbols
lim	Limit		math-symbols
θ	Theta: commonly an angle		math-symbols
λ	Lambda: wavelength, eigenvalue		math-symbols
μ	Mu: mean of a population		math-symbols
σ	Sigma (lowercase): standard deviation		math-symbols
ε (epsilon)	A very small positive number in limits		math-symbols
φ	Phi: the golden ratio (about 1.618) or an angle		math-symbols
e	Euler's number, about 2.71828		math-symbols
i	Imaginary unit, where i² = −1		math-symbols
ℝ	The set of real numbers		math-symbols
ℚ	The set of rational numbers		math-symbols
ℤ	The set of integers		math-symbols
ℕ	The set of natural numbers		math-symbols
ℂ	The set of complex numbers		math-symbols
∈	Is an element of		math-symbols
∉	Is not an element of		math-symbols
⊂	Is a subset of		math-symbols
∪	Union: in either set		math-symbols
∩	Intersection: in both sets		math-symbols
∅	Empty set: no elements		math-symbols
∀	For all		math-symbols
∃	There exists		math-symbols
∴	Therefore		math-symbols
∵	Because		math-symbols
⇒	Implies		math-symbols
⇔	If and only if		math-symbols
∥	Is parallel to		math-symbols
⊥	Is perpendicular to		math-symbols
∠	Angle		math-symbols
△	Triangle		math-symbols
≅	Is congruent to		math-symbols
∼	Is similar to		math-symbols
∝	Is proportional to		math-symbols
f(x)	Function f of x		math-symbols
f⁻¹	Inverse function of f		math-symbols
n!	n factorial: product of 1 to n		math-symbols
a:b	Ratio of a to b		math-symbols
⌊x⌋	Floor: greatest integer not above x		math-symbols
⌈x⌉	Ceiling: least integer not below x		math-symbols
mod	Modulo: the remainder after division		math-symbols
·	Dot: multiplication		math-symbols
→ (arrow)	Approaches, or maps to		math-symbols