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Cue mark - Wikipedia
Cue dots a.k.a. cue marks on ITV, BBC and UKTV - YouTube
A Rare "Cue dot" On The BBC - YouTube
The 'Thing' in the corner of the screen? — Digital Spy
Remember The Small White Blinking Boxes, Top Right Screen?
ELI5: Why on UK TV do black and white stripes appear in the ... - Reddit
Why do ITV still use cue dots? - Page 2 — Digital Spy
How were cue dots generated? - TV Forum
Why do ITV still use cue dots? — Digital Spy
Cue Dots - TV Forum