A question mark.

plural of atomic mass unit

a map that shows the analysis of meteorological quantities at various levels of the atmosphere

someone who is easily fooled or victimised

Short for Deutsche Mark.

(US) A faction of the US Republican Party whose policies include conservatism on social and personal matters, infusing religion into the American political process.

Synonym of to whom it may concern

(idiomatic) Even if that is the case; whether that is true or not; nevertheless.

Ilex paraguariensis, a plant used to make maté.

The proposed punctuation mark ؟ or ⸮, used to suggest irony or sarcasm in a question.