HT

from The Free On-line Dictionary of Computing (8 July 2008)

horizontal tabulation
HT
\t
TAB

   <character> (tab, Control-I, HT, {ASCII 9}) A character which
   when displayed or printed causes the following character to be
   placed at the next "tabstop" - the column whose number is a
   multiple of the current tab width.  Commonly (especially in
   Unix(?)) the tab width is eight, so, counting from the left
   margin (column zero), the tab stops are at columns 8, 16, 24,
   up to the width of the screen or page.

   A tab width of four or two is often preferred when indenting
   program {source code} to conserve indentation.

   Represented as "\t" in {C}, {Unix}, and derivatives.

   (1999-07-05)

from The Free On-line Dictionary of Computing (8 July 2008)

ht

   <networking> The {country code} for Haiti.

   (1999-01-27)

from V.E.R.A. -- Virtual Entity of Relevant Acronyms (June 2006)

HT
       Hyper-Threading (Intel, Pentium, SMT, CPU)

from V.E.R.A. -- Virtual Entity of Relevant Acronyms (June 2006)

HT
       Horizontal Tab