An exclamation is a statement or expression that shows strong feeling, surprise, excitement, anger, etc. It usually ends with an exclamation mark (!) to indicate emphasis and intensity. Examples include "Wow!" or "What a beautiful day!".
Anyway, sorry for excitement overload and excessive use of exclamation points on the blog today. (stillbeingmolly.com)
His use of exclamation marks in Macbeth would not be considered «creditworthy». (schoolsweek.co.uk)
He read constantly, even during the worst of his illness, and he would pore over literature on head trauma and brain disease, putting exclamation points in the margins and circling terms that he thought applied to him, such as «ice pick headache» and «disinhibition» and «dysfluency.» (scientificamerican.com)