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Number sign - Wikipedia
What's The #'s Real Name? - Dictionary.com
Number sign | Meaning & Symbol | Britannica
word choice - What Is the Real Name of the #? - English Language ...
Writing Tips: How to Use the Number Sign (#) - Proofed
Why is the symbol # called the hashtag in Twitter?
Number Sign – Rules and Examples - GRAMMARIST
The history of the hash symbol - New Statesman
Where Does the #Hashtag Symbol Come From? - PBS LearningMedia
Number Sign - Rules and Examples - Really Learn English