What's the "een" in Halloween?
Greek letter name, from a Semitic source akin to Hebrew lamedh.
lambda lamb·da (lām'də)n.
Symbol λ The 11th letter of the Greek alphabet.
The craniometric point at the junction of the sagittal and lambdoid sutures.
A version of typed lambda-calculus, used to describe semantic domains. ["Outline of a Mathematical Theory of Computation", D.S. Scott, TM PRG-2, PRG, Oxford U, 1971].