barre also
bar 
(bär)
KEY NOUN:
- A handrail fixed to a wall, as in a dance studio, used by ballet dancers as a support in certain exercises.
- A fingering technique used with fretted stringed instruments in which a finger is laid across the fretboard to stop all or several strings at once.
ETYMOLOGY:French, from Old French, from Vulgar Latin *
barra,
of Gaulish origin