The story
Introduced by Pidduck (1910–1912).
Etymology from Wiktionary, CC BY-SA 4.0.
Pidduck polynomial
Today it means: Any of a group of polynomials sₙ(x) given by the generating function displaystyle ∑ₙ(s_n(x))/(n!)tⁿ=((1+t)/(1-t))ˣ(1-t)⁻¹. Full definition →