number, identification number

a numeral or string of numerals that is used for identification; "she refused to give them her Social Security number"

• bank identification number, BIN, ABA transit number — an identification number consisting of a two-part code assigned to banks and savings associations; the first part shows the location and the second identifies the bank itself
• license number, registration number — the number on the license plate that identifies the car that bears it
• Social Security number — the number of a particular individual's social security account

• identification — evidence of identity; something that identifies a person or thing