Not sure if this question has been asked before, but do you have to put the LLC, INC, Corporation, etc on letterheads, business cards, etc at the end of the company name?

I've been trying to find an answer but can't seem to find a satisfactory one.

I've observed that some companies do put the LLC, Inc, Corporation on their business cards and letterheads and some other companies don't. So maybe it's okay to not include it? Are there any business laws that say you have to put your company formation at the end of your company name?

Thanks for your help.