Greek Letter - Lambda

Lambda - wikipedia.org
The lambda particles in particle physics. The set of logical axioms in the axiomatic method of logical deduction in first-order logic. The cosmological constant. Used as a shield pattern by the Spartan army; it stood for Lakedaimon, the name of the region.
en.wikipedia.org/wiki/Lambda

Lambda Bound in Three Ways
Lambda Calculus can be considered the theoretical foundation of computer science. Lambda stands for the Logos by whom everything was made according to the New Testament of the Bible.
www.lambda-bound.com/Welcome.html

Tetractys
Empedocles taught that there are two primal forces in the universe, Strife and Amity, which are the motive power behind the motion of the elements and the progress of the soul.
www.cs.utk.edu/~mclennan/BA/PT/D-moretet.html