A common alternative form of PIN (in the sense of "personal identification number").

(chemistry) The number of other atoms surrounding an atom in a molecule / (inorganic chemistry) The number of ligands surrounding a central metal atom in a coordination compound

(cricket) The batsman who bats last; usually the worst batsman in the side.

(complex analysis) An imaginary number.

A back issue of a magazine, etc. / Anything considered old-fashioned.

The study of the purported mystical relationship between numbers (or the letters of words, represented by numbers) and the character or action of physical objects and living beings.

(mathematics) Any of several complex numbers that are coordinates of the vertices of a regular polygon of unit radius

A system of numerals represented by letters of the Greek alphabet. These are used for special purposes, where in English Roman numerals might be used. The numerals are formed by the addition of a mark to the upper or lower case letter, i.e. Γ΄, δ΄, θ΄. In addition to the usual Greek letters three additional symbols are used: stigma (ϛ), koppa (ϟ) and sampi (ϡ); stigma (Ϛ or ϛ) may also be represented by ΣΤ΄ or στ΄.

Synonym of Greek numeral

One of the Greek numerals. A symbol formed from one or more of the letters of the Greek alphabet which has been modified by the addition of a mark, thus: Δ' θ'. These are used to numerate monarchs, chapters, etc as Roman numerals are used in English.