I was going to ask what a character means but I saw a closed question like it. So if there is a character and you are not sure if it even Japanese how should I structure it?
If you have a picture of a character we usually don't allow questions asking "what character is this?", because it is just a matter of looking up the character in a dictionary. Allowing such questions, we could have a question for every picture of every kanji character!
Exceptions could be characters that are particularly difficult to identify (such as cursive characters appearing in calligraphy or even in usual handwriting).
For looking up a character you can use the usual techniques via stroke count and radicals — there are even tools for character recognition from pictures, or from handwritten input.