/zed/ 1. (After Zermelo-Fränkel set
theory) A specification language developed by the
Programming Research Group at Oxford University around 1980.
Z is used for describing and modelling computing systems. It
is based on axiomatic set theory and first order predicate
logic. Z is written using many non-ASCII symbols. It was
used in the IBM CICS project.

See also Z++.

["Understanding Z", J.M. Spivey, Cambridge U Press 1988].

2. A stack-based, complex arithmetic
simulation language from ZOLA Technologies.