From the homepage; "7D2 party was the first party that had been organized in Turkey which had scene competitions like the other scene parties abroad. Party series named after the hexadecimal equivalent of 2002, $7D2. Since the sequential parties are named incrementally like 7D3, 7D4, 7D5, 7D6 etc., the parties are commonly called "7DX Parties". Starting from the year 2010, the name is fixed to 7DX. Party of this year is called "7DX Demo Party 2011". It's also called "7DX 2011" as its short form."