Cues from women to talk?

So I think this is an interesting question for both men and women.

Ladies: What do you do to catch a guys attention and hope he comes by to talk to you or interacts with you in anyway?

Fellas: When do you know you should approach a woman or that she is interested?

Now, I know the roles might be reversed, where the girl approaches and the guys don't... so if you do that, then also explain how you know when to approach?
Cues from women to talk?
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