Gemowe definition
Gemowe means “twin”). This is quite a famous example, as it is one of the very few cases where an author not only introduced a new symbol, but explained why he chose its particular form.
Gemowe means “twin”, compare “Gemini”; Robert Recorde, Whetstone of Witte (London, 1557), quoted in Florian Cajori, A History of Mathematical Notations. Vol. 1: Notations in Elementary Mathematics [1928] (New York, 1993), p. 165.