What does $$ mean in Javascript?

Question

I am looking at some javascript code and it has this in a function:

$$(\'.CssClass\').each(function(x) { .... } )

I get that the intent is

Answer 1

Probably this prototype function:

$$(cssRule...) -> [HTMLElement...]

Takes an arbitrary number of CSS selectors (strings) and returns a document-order array of extended DOM elements that match any of them.

http://www.prototypejs.org/api/utility#method-$$