The area comprising the cities of Raleigh, Durham and Chapel Hill in North Carolina. Used with "the" except when attributive. / Ellipsis of Bermuda Triangle.

The process of finding a solution to a problem by trying many possible solutions and learning from mistakes until success is attained.

A (usually male) member of a tribe.

One who goes trick-or-treating on Halloween, usually a child dressed in a costume.

To extort small treats on Halloween by implied threat of property damage or practical joke.

(mathematical analysis) The inequality that states that the magnitude of the sum of two vectors is less than or equal to the sum of the magnitudes of the vectors, or any equivalent inequality in other spaces.

(law) A trial by judge as opposed to a trial by jury.

The triceps in the upper arm.

A flag consisting of three stripes that are either vertical or horizontal; all of equal size, and of a different colour each.

Having three colours.