Girls, other than just spelling it out for us, what signs to you use that you think should be obvious to guys?

There was another question about 'should women spell everything out to guys' and to her she says that there are obvious signs she does that guys should pick up easily.

What signs do you use?

1. Either to attract the guy,

2. let him know you aren't interested,

3. let him know he did something wrong,

4. let him know he should apologize to you if he did do something wrong

5. any other signs you feel should be obvious to us.

And my final question is: Have guys picked up on these signs? If not do you really think they are that obvious to you?
Updates:
+1 y
Was expecting more answers than this. Oh well. :-\
Girls, other than just spelling it out for us, what signs to you use that you think should be obvious to guys?
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