What does TOS stand for?

Sierra Totonaca - Language code (ETLW)

Star Trek (The Original Series) - Movie (STREK)

Tactical Offense Subsystem

Tactical Operating System (SAUS)

Tactical Operation Simulation - Military (ACAE)

Tactical Operation Simulator

Tactical Operations Simulation (SAUS)

Tactical Operations Squadron - Air Force

Tactical Optical Sensor (SAUS)

Tactical Optical Surveillance (SAUS)

Taken on Strength - British military (DMA)

Taken Out of Service - Telecommunications (TEL)

Taligent Object Services - Taligent, Inc. - Computer science

Tape Operating System - IBM Corp. - Computer science

Team Operating System (SAUS)

Technical and Office Systems - Open Systems Interconnection (ODAA)

Technical Operational Support

Technical Operations Squadron - Air Force

Technology Option Study (SAUS)

Temporarily Out of Service (DEN)

Temporarily Out of Stock - Business term

Temporary Out of Service (SAUS)

Tennessee Orthopaedic Society (SAUS)

Tension of Oculus Sinister - Left eye (STED)

Terminal-Oriented Software - Computer science (IEEE)

Terminal-Oriented System - Computer science (IEEE)

Term of Service - Military

Test Operating System (MCD)

Texas Ornithological Society Bulletin (SAUS)

Text & Office Systems (SAUS)

Text Organizing System (SAUS)

The Operating System (SAUS)

The Orton Society (SAUS)

Thermally and Oxidatively Stable

Thoracic Outlet Syndrome - Medicine

Time of Service (SAUS)

Time-on-Station - Military

Time-On-Stream - Theory - Engineering

Time Operation System (SAUS)

Time Ordered System (SAUS)

Time-Ordered System (MCD)

Time-Sharing Operating System - Computer science (IAA)

TIROS - Television and Infrared Observation Satellite Operational Satellite - NASA

TIROS - Television Infrared Observational Satellite Operational System - Marine science

Top of Stack - Computer science

Top of Steel - Flooring (AAG)

Torque Overload Switch - Nuclear energy (NRCH)

Tosco Corp. - NYSE symbol (SPSG)

Tosco Corp., Los Angeles, CA - OCLC symbol (OCLC)

Toxic Oil Syndrome - Medicine

Toxic Oxygen Species (SAUS)

Traffic Orientation Scheme (DA)

Training Objective Statement - Training term (LPT)

Training Objective Statements - Personnel performance profile (PPP) (MLEX)

Tramiel Operating System - Atari, Inc.

Transfer of Station (ALAC)

Transfer Orbit Stage - Satellite booster

Tromso - Norway - Airport symbol (OAG)

Tropical Air Services - Belize - ICAO designator (FAAC)

Trouble Outage System - Management information systems

Trucial Oman Scouts - British military (DMA)

Truck Operational Surcharge (SAUS)

True Output Signal (SAUS)

Turbine Overhaul Services (SAUS)

Turkiye Ogretmenler Sendikasi

Type of Service (TNIG)

Type of Shipment

Type of Spares (SAUS)

Tosafoth (BJA)

Tosefta (BJA)

Tosyl - Also, Ts - Organic chemistry

Terms of Service (ODA)