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'''Programme Identification''' (PI) is a service provided by [[radio station]]s [[transmit]]ting [[Radio Data System]] (RDS) data as part of the [[FM radio]] [[broadcast]]. It is 4-digit hexadecimal number.
The PI code allows the radio to identify the station across different broadcasts / multiplexes. For example [[BBC Radio 1]] has PI <code>C201</code>. It is also used in [[Digital Audio Broadcasting|Digital Audio Broadcasting]] as Station ID.
PI code is usually not displayed on the radio receivers.
In allows listeners to stay tuned to a network whilst travelling across the service area of multiple [[transmitter]]s. It also allows listeners to a particular network to benefit from cross-network travel news services, [[traffic]] flashes and for the flagging of travel-related programming.
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