Having a sharp point

Commercial activity that is possibly dishonest while not actually being illegal. / (law) A lawyer's unfairly taking advantage of an opposing party's missteps or inexperience to gain an advantage.

(music) the theoretical major key with A-sharp as its tonic and the notes A#, B#, C𝄪, D#, E#, F𝄪, G𝄪. Such a high number of accidentals (especially double sharps) is undesirable. Therefore, it is usually scored and referred to as its enharmonic equivalent; B-flat major.

As sharp as a razor; extremely sharp. / (idiomatic) Very clever or quick-witted.

Having acute vision; having good eyesight. / Attentive, given to noticing things, aware.

Having an acrid or bitter wit. Often said of someone skilled at or given to insulting or belittling others.

Clever, keen of intellect, swift of thought.

Very sharp; as sharp as a needle / (of a sound) very high-pitched.

Alternative spelling of C-sharp

An object-oriented programming language named C#.