exclamation point
US /ˌek.skləˈmeɪ.ʃən ˌpɔɪnt/
UK /ˌek.skləˈmeɪ.ʃən ˌpɔɪnt/

1.
a punctuation mark (!) indicating an exclamation or strong feeling
:
•
Remember to add an exclamation point at the end of the sentence.
•
The sign had a large exclamation point to emphasize the warning.