Individual

In metaphysics, the word individual, while sometimes meaning a person, more typically refers to any numerically singular thing. Used in many contexts, both 'Socrates' and 'the Moon' denote individuals; 'grapefruit' and 'redness' (at least often) do not. 'Individual' as a piece of philosophical jargon is much-bandied and often to be found in the company of particular--indeed, often treated as synonymous with 'particular' (though one wonders if abstract particulars can count as individuals)--and contrasted with 'universal'.

A famous work on individuals and their individuation is by P. F. Strawson: Individuals: An Essay in Descriptive Metaphysics (London:

Methuen & Co. Ltd., 1959; New York: Anchor, 1963).