On public transportation, to tap a RFD-enabled ticket against a digital receiver in order to indicate the end of one's journey and pay the required fare. Passengers are reminded that they must tag off at their destination after disembarking from the tram, or they will be charged the full amount of a one-way journey. I know it said it would cost $5 when you got on the bus, but when you tag off it will come back down to $2.75.