In Roblox, alias refers to aliases set through the alias feature. The alias feature allows players to set an alias - meaning a nickname - for their friends. Aliases are only visible to those who create them, so if you set an alias for your friend, only you can see that alias.
The Alias feature is a feature on Roblox that was implemented on July 22, 2019. Roblox has not yet announced this feature, though it is open for public use. It is used to give friends a nickname, or alias they go by. It can be used by both <13 accounts and 13+ accounts.
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Roblox Usernames (Not Taken)
Like other online communities, Roblox uses common internet slang and slang exclusive to the community. These are words commonly used in the Roblox community, including slang.
BA - Bad Alien. Since a Roblox administrator accidentally called Alan ( JacksSmirkingRevenge) "Alien", this abbreviation was in popular use during TNL Twitch live streams. It has since fallen out of use and is rarely used. Banned forever - Termination of a Roblox account, phrase popularized by Roblox YouTuber Faave.
Camper - a term used in Roblox FPS games, mostly Murder Mystery 2, It means when a player stays in one spot and waits for players/enemies to walk past him/her before attacking. DD - Dishonorably discharged. Mainly used in military roleplay games, it means that a player has been demoted or told to leave.
Typically only used in games that utilize command scripts but can also be used in games that give users any sort of power over others. AFK - Away from keyboard, similar to BRB. Used to show the player being away from the keyboard to do other short real-life actions.