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

backslash
\
slosh

    "\" ASCII code 92.  Common names: escape (from
   C/Unix); reverse slash; slosh; backslant; backwhack.  Rare:
   bash; ITU-T: reverse slant; reversed virgule; INTERCAL:
   backslat.

   Backslash is used to separate components in MS-DOS
   pathnames, and to introduce special character sequence in
   C and Unix strings, e.g. "\n" for newline.

   (2000-02-21)