'''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 displayidentify the namestation ofacross thedifferent radiobroadcasts station/ -multiplexes. forFor example [[BBC Radio 1]] has PI <code>C201</code>. It is also used in [[Digital Audio Broadcasting|Digital Audio Broadcasting]] as Station ID.
In addition to this information which the listener can see, RDS also 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.▼
RDS receivers [[Code|decode]] the extra [[data]] contained within the [[FM radio]] [[Signal (electronics)|signal]] to display extra [[information]] on compatible [[radio]] receivers.
This information could include the name of the station, information about the programme's output - e.g. [[song]] titles, contact details (e.g. [[telephone number]]s) or the current time.
▲In addition to this information which the listener can see, RDS also 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.
The PI Code is also used by the [[RadioDNS]] standard.
