What is 134 in r134a compressor?

In the context of an R134a compressor, "134" refers to the refrigerant R-134a, which is a hydrofluorocarbon (HFC) used in air conditioning and refrigeration systems. The number "134" denotes its chemical structure, specifically the presence of 1,1,1,2-tetrafluoroethane. R-134a is known for its low ozone depletion potential and is commonly used as a replacement for R-12, which is more harmful to the environment.