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Hi,
The "PI" is the RDS Programme Identification code. This is a 4-digit hexadecimal number.
In the image you have shown, the "C203" is for BBC Radio 3.

Receivers can use the PI code to automatically retune to an alternative frequency, which is implemented in most car radios.

The attached wiki link provides information on RDS.
https://en.wikipedia.org/wiki/Radio_Data_System

73, Dave

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@Madsam106
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