How to abbreviate User Name?

The ways to abbreviate User Name.

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User Name(Wikipedia, Slang)
For more, try USER NAME on ALL ACRONYMS DICTIONARY
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APASmart Define. (2017). user name. Retrieved September 20, 2026, from http://smartdefine.org/user_name/abbreviations/a
ChicagoSmart Define. 2017. "user name" http://smartdefine.org/user_name/abbreviations/a (accessed September 20, 2026).
HarvardSmart Define 2017, user name, Smart Define, viewed 20 September, 2026, <http://smartdefine.org/user_name/abbreviations/a>.
MLASmart Define. "user name" 28 September 2017. Web. 20 September 2026. <http://smartdefine.org/user_name/abbreviations/a>