twirling baton

( n.)

   [PLATO]  The overstrike sequence -/|\-/|\- which produces an animated
   twirling  baton.  If  you  output  it with a single backspace between
   characters,  the  baton spins in place. If you output the sequence BS
   SP  between  characters,  the  baton spins from left to right. If you
   output  BS SP BS BS between characters, the baton spins from right to
   left. This is also occasionally called a twiddle prompt.

   The  twirling  baton  was  a  popular component of animated signature
   files  on  the  pioneering  PLATO educational timesharing system. The
   archie  Internet  service  is  perhaps  the  best-known baton program
   today;  it  uses  the  twirling baton as an idler indicating that the
   program  is  working on a query. The twirling baton is also used as a
   boot progress indicator on several BSD variants of Unix; if it stops,
   you're probably going to have a long and trying day.

[glossary]
[Reference(s) to this entry by made by: {plan file}{twiddle}]