V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

JTB
       Jump Trace Buffer (CPU)


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

jump trace buffer
JTB

   (JTB) A feature of some pipelined processors (e.g. Amulet,
   Pentium?) which stores the source and destination addresses
   of the last few branch instuctions executed.  When a branch
   instruction is fetched, its source is looked for in the JTB.
   If found, the next instuction fetch will be from the previous
   destination of that branch.  If it turns out that the branch
   shouldn't have been taken this time, then the pipeline is
   flushed.  This means that in a tight loop it is not
   necessary to flush the pipeline every time you jump back to
   the start.

   (1994-12-15)