Should you put a period after the exclamation point in Yahoo!?

 

I was editing a business proposal for a company that has an exclamation point at the end of its name, like Yahoo! but it’s not Yahoo! The company name came up multiple times in the document, sometimes at the end of a sentence.

In those instances, the writer followed the name with a period: Yahoo!.

Should the period be there? I asked some editors on social media. The answers I got were surprising and, at the same time, not at all surprising. Here's what I found out.

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