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

Branch and Hang
BRH

    (BRH) Originally a mythical instruction for the IBM
   1130 at Indiana University.

   Later some real examples were discovered.  The Texas
   Instruments TI-980 allowed all addressing modes with all
   instructions, including Store Immediate Extended (stores the
   value into the extension word of the instruction) and Branch
   and Link Immediate (makes a subroutine call to the same
   instruction -- Branch and Hang).

   Compare HCF.

   (1997-02-12)