What are some signs a girl is flirting with you/likes you?

Anonymous
I'm really attracted to this girl, I've gotten lots of signs from her (like flirting). One day wile I was talking to her, she was twirling her hair wile looking at me (she only did that once, probably only did it that moment because there was barely anyone around at the time), in class when I'm listening to her she will always look at me the most (not really looking at her friends), her shoulders and legs are always pointed towards me, even if she's across the room (I heard that was a sign a girl likes you).

I can feel a lot of sexual tension but I'm not sure if she feels the same way.
What are some signs a girl is flirting with you/likes you?
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