What is the different of this variable?[SOLVED]

[bliinkboy]

why do we have two icon condition here?are there any different of it?I read on the info,seem like different,but not quit understand.Could some one help in me in details pls?Thank you

[Xfire]

@bliinkboy just try and see. the second condition just you can created by coding

[bliinkboy]

thank you.just found out now

[ambrogio]

@bliinkboy double click on it and an explanation will appear