1. Precursor to SQL.

["System R: Relational Approach to Database Management", IBM Res Lab, San Jose, reprinted in Readings in Database Systems].

2. U Leeds. Theorem prover specification language. Pattern matching notation similar to Prolog. Compiled into Lisp.

[Proc ICJAI 13].

Nearby terms:

SEPPSequeSequelsequenceSequenced Packet Exchangesequencer

Try this search on Wikipedia, Wiktionary, Google, OneLook.