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Where I'm from (UK) this has always been called the "hash" symbol. Although British Telecom voice prompts insisted on calling it the "square" key for a while.

• Symbiote 10y ago
  "For drugs, press the hash key" To hash means to chop up, which is a possible origin. To [cross] hatch means to colour in a space with [crossed] parallel lines, which is also possible. (I know you know this. Others probably don't.)
  • nicky0 10y ago
    Corned Beef #.