(chemistry) A covalent bond in which three electron pairs (instead of the usual one) are shared between two atoms; most common between carbon atoms and carbon or nitrogen atoms, but a few other forms are known. Symbolized in formulae as ≡.

(basketball) The achievement of a two-digit number of any three of points scored, assists, rebounds, blocks, or steals in a single game.

(finance) Simultaneous expiry on US markets of stock index futures, stock index options, and stock options, which took place on the third Friday of March, June, September, and December. (With the introduction of single stock futures those days are now quadruple witching.)

(cricket) three hundred runs scored by a single batsman in one innings, or by two batsmen in a partnership

(mathematics) A set of three positive integers a, b and c, for which a²+b²=c²

(golf) A score of three over par (for one hole)

Any of several triple-distilled liqueurs flavoured with fruit e.g. Curaçao, Cointreau, and Grand Marnier. / A branded liqueur from Curaçao flavoured with orange peel.

An athletics field event where one has to travel as far as possible after taking one hop, a step, then a jump.

To perform in this athletics event.

(chess) A pawn that is on the same file as two friendly pawns.