The symbol of Rediffusion television and British Electric Traction. Its name comes from the former army offices where Rediffusion was based, Adastral house.
The logo itself is a sixteen-pointed star, with its points ending up rotated 16 degrees clockwise from where they started off. It is now used as a generic symbol meaning "TV advert".
It is currently trademarked in the UK by Rentokil Initial. Rediffusion is a brand name used even today on speakers and radios.