Girls, if you want some guy you don't know yet to talk to you, what kind of signals do you send?

gemgem
I know most girls do not begin conversations themselves, but try to make guys approach them. What do you do to signal to a guy that you want him to talk to you, especially if you are in a public place and it is a stranger or someone yo7 don't know well?
Girls, if you want some guy you don't know yet to talk to you, what kind of signals do you send?
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