Q:

What do you call a company logo used for ad purpose?

I am not sure if there's a word for it, but I am asking the question, because I have trouble making a sentence sound fine without such a word. I am not sure if it's one of those cases where we can do nothing about it, but I feel there might be a rarely used word that might be of help.
Here's an example:

He tattooed a bunch of company logos on his arms for advertisement
  purpose.

Company logos sounds weird, there must be at least a word that corresponds to company logos even if there's no perfect match for "company logo used for ad purpose".

A:

"He tattooed a bunch of company trademarks on his arms for advertising purposes."
"A trademark, trade mark, or trade-mark is a recognizable sign, design, or expression which identifies products or services of a particular source from those of others"

