Empty delta sign
For illustration purposes.
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The delta shape is probably most known to the public at large in the shape of the wings of the supersonic aeroplane, Concorde.
Delta is the 4th letter of the Greek alphabet with a characteristic triangular shape.
The delta shape is probably best known to the public at large in the shape of the wings of the now non-operational supersonic aeroplane, Concorde.
The term empty delta sign represents a cerebral venous sinus thrombosis, typically in the sagittal sinus, which has the shape of a delta.
Photograph courtesy of Ian Bickle, BSB, Brunei.