Notation used in mathematical writing and equations.
A sideways figure-eight (∞) denoting an unbounded quantity in mathematics, and used more broadly as a symbol of endlessness.
Two short horizontal parallel lines (=), denoting that the values on either side are equal.
The mathematical sign for subtraction, written as a single horizontal stroke.
The diagonal cross used to indicate multiplication.
The mathematical sign for addition, written as an upright cross.
A horizontal stroke with a dot above and below, indicating division.
A plus sign above a minus stroke, giving a tolerance or two possible values.
Two small circles either side of a diagonal stroke, meaning 'per hundred'.
A percent sign with an extra circle, meaning 'per thousand'.
The Greek letter used for the ratio of a circle's circumference to its diameter.
A hooked stroke with a horizontal bar, indicating a root of a number.
The capital Greek sigma, used to indicate a sum over a series.
An elongated S indicating integration in calculus.
A small raised circle marking degrees of temperature, angle or arc.
An equals sign struck through by a diagonal stroke, meaning inequality.
Two stacked wavy strokes, meaning 'roughly equal to'.
Three dots in an upward-pointing triangle, introducing a conclusion.
The fifth Greek letter, conventionally a very small positive quantity.
The first Greek letter, used across science for angles, rates and particles.
The second Greek letter, used for beta particles, coefficients and angles.
The third Greek letter, used for gamma rays, functions and display response.
The fourth Greek letter, meaning change or difference in almost every field.
The eighth Greek letter, the default name for an angle.
The eleventh Greek letter, used for wavelength, eigenvalues and anonymous functions.
The twelfth Greek letter, and the SI prefix for one millionth.
The eighteenth Greek letter, used for standard deviation and stress.
The seventeenth Greek letter, used for density and resistivity.
The twenty-first Greek letter, used for the golden ratio and magnetic flux.
The last Greek letter, used for angular velocity — and the source of the ohm sign.
A vertical stroke above a dot, marking emphasis.
A rounded epsilon meaning membership of a set.
A wavy horizontal stroke with several unrelated uses.
A single upright stroke, used as a separator and an operator.
A lower-case m, the SI unit symbol for the metre.
The two-letter symbol kg, the SI unit symbol for the kilogram.
A lower-case s, the SI unit symbol for the second.
A capital A, the SI unit symbol for the ampere.
A capital K, the SI unit symbol for the kelvin.
The three letters mol, the SI unit symbol for the mole.
The two letters cd, the SI unit symbol for the candela.
The two letters Hz, the SI unit symbol for the hertz.
A capital N, the SI unit symbol for the newton.
The two letters Pa, the SI unit symbol for the pascal.
A capital J, the SI unit symbol for the joule.
A capital W, the SI unit symbol for the watt.
A capital V, the SI unit symbol for the volt.
A capital F, the SI unit symbol for the farad.
A capital T, the SI unit symbol for the tesla.
The two letters lm, the SI unit symbol for the lumen.
The two letters lx, the SI unit symbol for the lux.
The two letters Bq, the SI unit symbol for the becquerel.
The two letters Sv, the SI unit symbol for the sievert.
A degree sign followed by a capital C, marking a temperature in Celsius.
A degree sign followed by a capital F, marking a temperature in Fahrenheit.
A lower-case Greek mu with a straight descender, used as the SI prefix for one millionth.
A lower-case k, the SI prefix for a factor of one thousand.
A capital A with a small ring above it, marking a length of 10⁻¹⁰ metres.
A capital or lower-case L, the symbol for the litre.
The two letters dB, marking a ratio on a logarithmic scale.
An angle bracket opening to the right, stating that the left value is smaller.
An angle bracket opening to the left, stating that the left value is larger.
A less-than wedge with a bar beneath it, allowing equality as well.
A greater-than wedge with a bar beneath it, allowing equality as well.
An inverted capital A, the universal quantifier of formal logic.
A mirrored capital E, the existential quantifier of formal logic.
A circle crossed by a diagonal stroke, denoting the set with no members.
A rounded bracket opening right, stating that one set is contained in another.
A rounded U shape, denoting everything in either of two sets.
An inverted rounded U, denoting what two sets have in common.
A pointed caret, denoting conjunction in formal logic.
A pointed V, denoting inclusive disjunction in formal logic.
A horizontal bar with a short downward tick at its right end, denoting logical not.
A double-shafted arrow pointing right, denoting logical implication.
A double-shafted arrow with heads at both ends, denoting logical equivalence.
A looped form resembling an open alpha, stating a constant ratio.
A small wedge open to the right, prefixing the name of an angle.
An upright T shape with the crossbar at the foot, stating that two lines meet at a right angle.
Two vertical strokes side by side, stating that two lines never meet.
An inverted solid triangle, denoting the vector differential operator.
A rounded d with a curled top, marking differentiation in one variable.
A large capital pi, denoting the product of a sequence of terms.
An italic lower-case c, denoting the speed of light in vacuum.
An italic lower-case h, denoting the quantum of action.
An italic k, often subscripted B, relating temperature to energy.
A capital N with subscript A, the number of entities in a mole.
An italic lower-case e, the magnitude of the charge on a proton.
An italic capital G, the constant in Newton's law of gravitation.
A Greek lambda, denoting the distance between successive wave peaks.
A t with subscript one-half, the time for half a quantity to decay.
A capital delta before an H, denoting heat absorbed or released.
Two parallel lines between atoms, representing a shared double bond.