The difference between Hashtag and Octothorpe
When used as nouns, hashtag means a metadata tag, signaled by a preceding hash sign (#), used to label content, whereas octothorpe means the hash or square symbol (), used mainly in telephony and computing.
Hashtag is also verb with the meaning: to label (a message) with a hashtag.
check bellow for the other definitions of Hashtag and Octothorpe
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Hashtag as a noun (Internet):
A metadata tag, signaled by a preceding hash sign (#), used to label content.
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Hashtag as a noun (internet, informal):
The hash sign itself.
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Hashtag as a verb (transitive, Internet):
To label (a message) with a hashtag.
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Octothorpe as a noun (chiefly, US, typography):
The hash or square symbol (), used mainly in telephony and computing.