hashtag
n.— «What does it mean when somebody puts a number sign before a word in an online post? That’s called a hashtag, for the hash mark preceding the word (right, yet another name for the symbol we also call the number sign and the pound sign). People on sites like Twitter use these labels to make it easier for others to spot their postings.» —“Fast Forward’s Help File” by Rob Pegoraro Washington Post Feb. 21, 2009. (source: Double-Tongued Dictionary)
Further reading
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