• An exclamation mark looks like this:

!

• An exclamation mark indicates the end of a sentence that is either an actual exclamation, or is intended to be astonishing in some way
• The exclamation mark or exclamation point is a punctuation mark usually used after an interjection or exclamation to indicate strong feelings or high volume (shouting), and often marks the end of a sentence.
• A sentence ending in an exclamation mark may be an exclamation (such as "Wow!"), or an imperative ("Stop!"), or may indicate astonishment: "They were the footprints of a gigantic duck!"
• Informally, exclamation marks may be repeated for additional emphasis ("That's great!!!"), but this practice is generally considered unacceptable in formal prose.
• The exclamation mark is sometimes used in conjunction with the question mark. This can be in protest or astonishment ("Out of all places, the squatter-camp?!").
• Several studies have shown that women use exclamation marks more than men do, and one study suggests that, in addition to other usage, exclamation points may also function as markers of friendly interaction, for example, by making "Hi!" or "Good luck!" seem friendlier than simply "Hi." or "Good luck." (with periods).

• "Wow!"
• "Stop!" (a command)
• "They were the footprints of a gigantic hound!" (astonishing)
• "That's great!"
• "Hi!"
• "Good luck!"