What does the SQL # symbol mean and how is it used?

Question

Can someone please explain to me what the # symbol means in MS SQL Code.

I\'ve tried Googling it, and even searching on StackOverflow,

Answer 1

They normally prefix temporary tables.

From the docs....

Prefix local temporary table names with single number sign (#table_name), and prefix global temporary table names with a double number sign (##table_name).