What mark of punctuation is most closely associated with interjections?

http://grammar.ccc.commnet.edu/grammar/marks/exclamation.htm

I think the !

The mark of punctuation that is most closely associated with interjections is the exclamation point. Interjections are words or phrases that express strong emotions. In written language, they are often followed by an exclamation point to emphasize the emotional intensity of the expression.

To determine the mark of punctuation associated with interjections, you can follow these steps:

1. Identify if the sentence contains a word or phrase that expresses strong emotions or sudden exclamations. Common interjections include "wow," "oops," "oh," "yeah," "ouch," "ah," and "hey," among others.

2. Once you have identified the interjection, check if it is followed by any punctuation marks. Typically, interjections are immediately followed by an exclamation point (!) to indicate the emotional intensity or surprise associated with the expression.

It is important to note that not all interjections require an exclamation point. Some interjections can be punctuated with a comma or period, depending on the context and intensity of the emotion being expressed. However, the exclamation point is most commonly used to convey the strong emotions associated with interjections.