TS - Task Switched

TS/SI - Top Secret / Sensitive Information

TSAP - Transport Service Access Point

TSAPI - Telephony Services Application Program Interface

TSD - Time Stamp Disable

TSDU - Transport Service Data Unit

TSE - The Stemware Editor

TSL - Three Static Logic

TSO - Technical System Option

TSO - Time Sharing Option

TSOP - Thin Small Outline Package

TSP - Traveling Salesperson Problem

TSR - Terminate and Stay Resident

TSS - Time - Sharing System

TSSE - Total Sum of Squared Errors

TST - Time - Space - Time

TST - Test

TSTN - Triple Supertwisted Nematic

TSV - Tab Separated Values

TT - Typewriter Text

TTA - Transport - Triggered Architecture

TTCN - Tree and Tabular Combined Notation

TTF - TrueType Font

TTFD - Testing Timing Factors Definition

TTL - Time To Live