REDUNDANT ACRONYMS THAT ARE REDUNDANT

There's a rather delightful concept called RAS syndrome, where RAS means "redundant acronym syndrome". This describes situations when there's accidental repetition in a word following an acronym. Here are some common examples:ATM (automatic teller machine) machine

• ISBN (international standard book number) number
• RPG (role-playing game) game
• HIV (human immunodeficiency virus) virus
• LAN (local area network) network
• LCD (liquid crystal display) display
• PDF (portable document format) format
• CNN (cable news network) network
• BBC (British broadcasting corporation) corporation
• IBM (International Business Machines) machine
• OPEC (organization of petroleum exporting countries) countries
• IRA (individual retirement account) account

​I think it's really cool how those tautologies are used in everyday (even professional) parlance and I just wanted to share that.