The Free On-line Dictionary of Computing (30 December 2018):

100BaseT

    Any of several Fast Ethernet 100 MBps
   CSMA/CD standards for twisted pair cables, including:
   100BaseTx (100 Mbps over two-pair Cat5 or better cable),
   100BaseT4 (100 Mbps over four-pair Cat3 or better cable),
   100BaseT2 (in committee; 100 Mbps over two-pair Cat3 or better
   cable).  All are standards (or planned standards) under IEEE
   802.3.

   (1997-01-07)