Instead of creating a whole thread, you could have done a simple Google search. Also, nowadays we have AI getting you all your answers. Try that?
If you are a boomer and still don't know what OP is, it's an Original Poster. Currently, you are the OP for this thread.
not gonna lie, i have searched abbreviation of OP on Google about three or four months ago before this thread is created, at that time after searching it i am still not sure wheter it is Original Poster or Original Post becuase we maybe got invalid information only from google.
OP: Original Poster (like you explained) or Original Post.
they can differentiate what OP implies for either Original Poster or Original Post. It must be taken in to a specific context.
This is also what is tranthidung concern about.