They can be anything you want them to be as long as you put a $ in front of the word eg. $var1, $var2
A couple of rules for naming variables though: They can only inlcude letters, numbers and underscores; They must begin with either an underscore or letter, not a number!
There are some exceptions though there are some predefined variables click here for more information of predefined variables
Remember that variable names ARE case sensitive so $var is different to $Var
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