BBC Television Service (Test Cards)

Test Card (2 November 1936-1 September 1939, 7 June 1946-2 December 1953)
Visuals: There were many variants including wave-shaped colour bars in different shades of white and black, along with one that consists of a "compass" with some bat wing-like shapes on the sides in various shades of grey with "BBC" on the top and bottom, all on a grey BG.

Trivia: The "Bat Wings" ident was designed by, a British graphics designer.

Audio: None, but may contain music and/or a continuity announcer.

Availability: These usually appeared at the start of BBC's broadcasts around this time.