 Edward Guggenheim introduced the symbol G for the Gibbs free energy in 1933, and this was used also by Dirk ter Haar in 1966. This notation is now universal and is recommended by the IUPAC. In 1960, William Giauque and others suggested the name "gibbs" (abbreviated gbs.) for the unit of entropy, calorie / Kelvin, but this usage did not become common and the corresponding SI unit, Joule / Kelvin, carries no special name.
