They normally prefix temporary tables.
From the docs...
http://stackoverflow.com/questions/3166117/what-does-the-sql-symbol-mean-and-how-is-it-used
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).
http://stackoverflow.com/questions/3166117/what-does-the-sql-symbol-mean-and-how-is-it-used
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