The Robux name was conceived by Shedletsky, being a portmanteau on 'Roblox' and 'bucks'.
Robux were one of two currencies on the platform alongside Tix, which was removed on April 14, 2016. Robux (formerly denoted by R$) is the virtual currency used across the Roblox platform. All Roblox gift cards will be redeemable for credit denominated in your local currency.
Beginning in April 2023 Roblox credit will no longer be denominated in U.S.