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Mark Barr was an American mathematician who, according to Theodore Andrea Cook, in about 1909, gave the golden ratio the name of phi (ϕ), the first Greek letter in the name of Phidias, the Greek sculptor who lived around 450 BC.
- Cook, Theodore Andrea (1914). The Curves of Life: Being an Account of Spiral Formations and Their Application to Growth in Nature, to Science and to Art: with the special reference to the manuscripts of Leonardo da Vinci. London: Constable. p. 420., reprinted in 1979 by Dover Publications, New York, ISBN 0-486-23701-X.
- Walker, Susan C. (18 June 2007). "Happy Phi Day -- Perfect Time for Some 'Phinancial' Fun". Fox News. Archived from the original on 11 February 2009.
- Schooling, William (1915). "A Method of Computing Logarithms by Simple Addition". Napier Tercentenary Memorial Volume. Royal Society of Edinburgh. p. 344.
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