Bar xagasha, oo sidoo kale loo yaqaan "L-bracket" ama "birta xagasha," waa guntin bir ah oo qaab ahaan u ah xagal qumman.Baararka xagasha ayaa inta badan loo adeegsadaa in lagu taageero alwaaxyada iyo meelaha kale, laakiin faa'iidadooda ayaa dhaaftay doorkooda caadiga ah.