How did someone post this odd symbol in a comment?

[mixdenny]

It’s just a plain comment field, no graphics. At the end of this sentence:

I grew up here 1959-1978‼️

[pjd]

Probably from here (or somewhere similar).
Just select the symbol you want and copy it.

[gnoitall]

We have a version of that in the Discourse emoji palette: :bangbang:

[Saint_Cad]

@gnoitall

We have a version of that in the Discourse emoji palette:

Do you use that if your baby shoots you down?

[Reply]

[LSLGuy]

I know I know!!

That says “To be one, ask one.”

[Ike_Witt]

I like.