What is the punctuation for am?

"am" doesn't have any specific punctuation. It's a part of a verb, usually "I am" or "we are," and the punctuation depends on the sentence structure:

* Period (.) if it's at the end of a declarative sentence: "I am happy."

* Question mark (?) if it's at the end of an interrogative sentence: "Are you coming?"

* Exclamation mark (!) if it's at the end of an exclamatory sentence: "I am so excited!"

* Comma (,) if it's part of a compound sentence: "I am going to the store, and I'll pick up some milk."

The punctuation for "am" itself doesn't change, it depends on the whole sentence and what type of sentence it is.