# Need help understanding precalc symbols?

Studying for precalc. Came across this weird symbol I have never seen before.
Ā
If A = {3, 6, 9, 12}
would this mean A ≠ {3, 6, 9, 12} and that would be the acceptable answer? This is just the way I am looking at it but it seems to be wrong.
Another symbol I am looking at is this...
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Studying for precalc. Came across this weird symbol I have never seen before.

Ā

If A = {3, 6, 9, 12}

would this mean A ≠ {3, 6, 9, 12} and that would be the acceptable answer? This is just the way I am looking at it but it seems to be wrong.

Another symbol I am looking at is this one:

http://i.imgur.com/iidxQBR.png

Again I have never seen this symbol but I know it will be on a quiz soon.

Ā

If A = {3, 6, 9, 12}

would this mean A ≠ {3, 6, 9, 12} and that would be the acceptable answer? This is just the way I am looking at it but it seems to be wrong.

Another symbol I am looking at is this one:

http://i.imgur.com/iidxQBR.png

Again I have never seen this symbol but I know it will be on a quiz soon.

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