Jacob's staff /jāˈkəbz stäf/

1. A pilgrim's staff (obsolete)
2. Any of several different surveying instruments of different periods
3. A sword-stick (obsolete)

• backpackings
• backpacks
• back pass
• back passage
• back passages
• back passes
• back pay
• back-pedal
• back-pedalled
• back-pedalling
• back-pedals
• backpiece
• backpieces
• backplate
• back pressure
• back-projection
• back-projections
• backra
• backras
• back rest
• back rests
• backronym
• backronyms
• back room
• backroom