It's the "ht" in http & html
HTTP) must be followed when ... 
Hyperlinks created with the link element and its rel attribute apply to the ...... 
briefly describing what it is, one for the letters "HT" expanding them to... [DOC] [TLE] A Package in a league of its own: Helm - Table of Contents [PAR] Helm can resize its buffer automatically to fit the number of candidates if you 
enable helm-autoresize-mode : ...