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Concentric black/white rings in top right of screen throughout BBC TV broadcast (UK) : r/whatisthisthing
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Why does ITV have a black-and-white rolling image in the top left hand corner to signify the adverts are about to start? - Quora
Why does ITV have a black-and-white rolling image in the top left hand corner to signify the adverts are about to start? - Quora
![Scott Bryan on Twitter: "Channel 5 have appeared to have gone into backup mode. You can tell as there is a black / grey square at the top right hand corner of Scott Bryan on Twitter: "Channel 5 have appeared to have gone into backup mode. You can tell as there is a black / grey square at the top right hand corner of](https://pbs.twimg.com/media/FAJ0NddUUAMeDFt.jpg:large)
Scott Bryan on Twitter: "Channel 5 have appeared to have gone into backup mode. You can tell as there is a black / grey square at the top right hand corner of
Scott Bryan on Twitter: "Channel 5 have appeared to have gone into backup mode. You can tell as there is a black / grey square at the top right hand corner of
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