[MV=PY]

"The story of the hashtag begins sometime around the fourteenth century, with the introduction of the Latin abbreviation “lb,” for the Roman term libra pondo, or “pound weight.” Like many standard abbreviations of that period, “lb” was written with the addition of a horizontal bar, known as a tittle, or tilde .."

I didn't know that - it's interesting. Any good site for further reading?

[smokingfrog]

http://www.worldwidewords.org/weirdwords/ww-oct1.htm