Testing abbreviations (terminology)

The following abbreviations are used while representing the various lifecycles.

Abbreviations
LOI
Letter Of Intent
WO
Work Order/TSOP
ATP
Acceptance Test Plan / Acceptance Test Planning
AT
Acceptance Test
STP
System Test Plan / System Test Planning
ST
System Test
ITP
Integration Test Plan / Integration Test Planning
IT
Integration Test
UTP
Unit Test Plan / Unit Test Planning
UT
Unit Test
BRS
Business Requirements Specification
FS
Functional Specification
DS
Design Specification
HLD
High Level Design
DD
Detailed Design