Do you mean n! then if so it stands for "n factorial" which means a given number is to be multiplied each time from itself to one.
Examples:
3! = 3*2*1 = 6
4! = 4*3*2*1 = 24
6! = 6*5*4*3*2*1 = 720
Some calculators have a factorial key that can perform these calculations.
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Power
The exclamation mark almost always indicates factorial, i.e. n! = 1*2*3*...*n. Therefore 4! would be 1*2*3*4 = 24. Additionally, the exclamation mark can indicate negation, e.g. in computer programming and logic.
"?" This sign is called a "Question-Mark." It tells the reader that it's a question. For example: What's your favorite color?
hyphen
A question mark (?) is a symbol used to indicate an interrogatory sentence. It can be found on questions like:How are you today?What grade of school are you in now?Where do you work?