1. Query language, close to natural English. 2. User System Language. Bellcore, "Operations Technology Generic Requirements: User System Interface", TR-825. 3. Unix System Laboratories: the software subsidiary of ref="module.php?name=Lexikon&file=search&eid=1&query=AT&T">AT&T, responsible for ref="module.php?name=Lexikon&file=search&eid=1&query=Unix">Unix ref="module.php?name=Lexikon&file=search&eid=1&query=System V">System V and related software.

In addition suitable contents:
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