How to tell if a guy likes you from afar?

Anonymous
There’s this guy who i don’t know very well. We work at the same place but not really together as he is in a different department to me, though our work does cause us to cross paths on occasion.
I’m not sure, but i have a feeling he might like me, or be interested in me at least.
I’ve noticed him, he is attractive, and i want to know if i am right in thinking he might have noticed me too.

What are some ways guys would behave or show they are attracted to a girl they dont know well? What if he were shy?
How to tell if a guy likes you from afar?
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