The term 'GAS PUMP ABBR.' refers to three abbreviations commonly used in the context of gas pumps. The abbreviation REG stands for 'REGULAR', GAL stands for 'Gallon', and ERL stands for 'Erlenmeyer'. These abbreviations are used to indicate the type of fuel being dispensed from a gas pump, with REG referring to REGULAR gasoline, GAL referring to the amount of fuel being dispensed, and ERL referring to a type of container used to store fuel.