<math>r\ =\ \theta^{1/2}</math>
It is a type of Archimedean spiral
See also: Polar coordinates, Spiral
... - Graham Hill, (United Kingdom) 1966 - Jackie Stewart[?], (United Kingdom) 1967 - Denny Hulme[?], (New Zealand) 1968 - Graham Hill, (United Kingdom) 1969 - Graham ...