There are multiple definitions:

1. 6 alpha-tigloyloxychaparrinone(English)

   • an inhibitor of HIF-1 activation
   • HIF-1, MAP, ERK1/2, MNK1
   • Oncology, Oxygen
   • https://doi.org…har.2008.06.104

2. Temporary Contact Number(English)

   • a decentralised contact tracing protocol based on the exchange of 128-bit temporary IDs among nearby smartphones using BLE
   • TAN, COVID-19, BLE
   • Mobile health, Data exchange, Communication
   • https://doi.org…55/2020/8851429