I couldn't find anything in the wiki about hashtags #, so I'm just gonna ask here. What do hashtags do in script?

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Usually to translate the number of characters in a string or table to a, well, number. (print(#'I'm a string!') print(#{'I'm', 'in', 'a', 'table!'})) Think of it similar to string.len http://wiki.roblox.com/index.php?title=Global_namespace/String_manipulation#string.len