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  1. (Britain, initialism) Trains Entering Terminal Stations: a failsafe device for stopping trains that are entering a station at the end of a railway line.
    • 2011, Christopher Fowler, Bryant and May Off the Rails, →ISBN, page 128:
      The driver had three hundred quid in his pocket when he died - he was going to put a deposit on a car for his daughter after his shift. That's not the action of a suicide. I suppose some good came out of it, with TETS.
    • 2015, Richard M. Jones, End of the Line - The Moorgate Disaster, →ISBN, page 166:
      The accident led to the introduction of TETS, or Trains Entering Terminal Stations (London Underground) or alternatively Moorgate Control (National Rail), named after the disaster and introduced on all dead-end terminal stations.
  2. (medicine, initialism) Transcutaneous Energy Transmission System: an experimental subcutaneous device for generating current in heart patients.
    • 2006, Hidekazu Miura, Fumihiro Sato, Hidetoshi Matsuki, & Tadakuni Sato, “Primary Power Factor Controlled Transcutaneous Energy Transmission System”, in Future Medical Engineering Based on Bionanotechnology:
      TETS however, has the problems of fluctuation of coupling factor and load resistance. TETS must be controlled to ensure stable power transmission.
    • 2007, Ryohei Saisho, Takuya Ohsugi, Masaya Watada, Yong-Jae Kim, Katsuhiro Ohuchi, Setsuo Takatani & Yong-su Um, “The re-design of Transformer portion in Transcutaneous Energy Transmission System for Left Ventricle Assist Device”, in World Congress of Medical Physics and Biomedical Engineering 2006, page 3150:
      The internal unit and TETS coil were implanted into subcutaneous space at the abdominal wall.
    • 2016, Mary Mehrnoosh Eshaghian-Wilner, Wireless Computing in Medicine, →ISBN:
      A research team from the University of Pennsylvania tested the health effects of the TETS‐powered ventriculus sinister assistant device [63]. They implanted a 160 kHz max power 16.9W TETS system into a cow's body.
  3. (initialism) tetramethylenedisulfotetramine.
    • 2011, Gary Strange, ‎William Ahrens & ‎Robert Schafermeyer, Pediatric Emergency Medicine: Just the Facts, Second Edition, →ISBN:
      TETS binds noncompetitively and irreversibly to GABA receptors on neuronal cell membranes and blocks chloride channels.
    • 2013, GABA Receptors—Advances in Research and Application, →ISBN:
      We characterized TETS as an activator of spontaneous Ca2+ oscillations and electrical burst discharges in mouse hippocampal neruonal cultures at 1317 days in vitro using FLIPR Fluo-4 fluorescence measurements and extracellular microelectrode array recording.
    • 2014, Charlie Charters, Bolt Action, →ISBN:
      And there is no proven antidote to TETS. Once ingested, the poison attacks the membranes of the neurone cells, causing death by convulsion in seconds.
    • 2016, Song Ying, Apricot's Revenge: A Crime Novel, →ISBN, page 158:
      In his stomach and vomit the ME found traces of Tetramethylenedisulfotetramine, commonly known as TETS, or, in simplest terms, rat poison.