What are signs a girl is checking you out?

Anonymous
Before you tell me this is a dumb question and everything about it should be very obvious, I need to tell you all that throughout most of my life I have not been very observant to my surroundings, especially with people. I blame it on ADHD. But I've gotten better as I've gotten older. Because I haven't been all that observant with body language, I don't read people very well, especially people I don't know very well (strangers). I have actually had friends tell me "she was checking you out, didn't you notice? why didn't you talk to her?''

My guess is they do it most often when the guy ain't looking. Because I feel awkward when a girl catches me checking her out.
What are signs a girl is checking you out?
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