- Initialism of Can't Remember Shit.
- (US, realtors) Certified Residential Specialist
- (cartography) Initialism of Cartographic Reference System.
- (computing, aviation, travel) Central/Computer Reservation System
- (space science, NASA) Initialism of Commercial Resupply Services.
- (technology) Initialism of cold rolled steel. (Steel that has been processed while remaining relatively cold. Often cold rolled steel is coated in oil to prevent corrosion.)
- (UK) Initialism of Co-operative retail Services.
- (government, US) Initialism of Congressional Research Service.
- Initialism of Chinese restaurant syndrome.