Twitter invented the hash tag (#) in 2006. Before this its use was completely unknown and only ever occurred when an Apple Mac user accidentally pressed (alt+3) instead of (shift+3) when trying to use the Pound sign (£).
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1. CIRCLE 2. TRIANGLE 3. X LIKE SHAPE 4. HASH 5. EQUALS SIGN The hash looks like this #
The plus or addition sign was invented by Michael Stiple in 1544
The person who invented the plus sign is the same as the minus
The symbol used before a number to make it a label is a hash sign (#).