it means you sqaure the number (multiply it by itself)
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x2 means "x squared" aka "x to the power of 2"
well for example if you had 2 to the power of 2 then you would multiply it two times. 2 times 2 = 4
O2- is the symbol for the oxide ion, which is an oxygen atom that has gained two electrons. The oxide ion has a charge of -2.
little of it
x squared. for example, if you will substitute "4" from "x" then,x=4;x²=4²=16. the small 2 indicates that you will multiply the number by itself.