Because the word bit is a "tag" and the symbol at the start "#" is called a "hash".
The hash tag symbol is used to highlight or stress the words in use.
why do people use hash sign in texting and facebook
no they do not allow .
By clicking on it.
bash rash hash cash
Super Sunday - 2012 Hash Tag IRL 1-11 was released on:USA: 2 June 2013Super Sunday - 2012 Hash Tag IRL - 1.11 was released on:USA: 2 June 2013
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Hash Tag or/and link to another website
A Documentary of Life - 2012 Hash Tag Stage Left 2-27 was released on: USA: 14 March 2013
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the "number symbol" ( You know 'item # 4.')