British army military barracks,Summerhill, Nenagh, Co. Tipperary. 19th-century upright boundary stone No 4 now built into doorway of a house on the north side of the entrance to the barracks. Stone marked the front boundary of the property belonging to the military barracks. B ↑ O which stands for Board of Ordnance. The broad arrow pointing upwards carved between the B O of which the pheon is a variant, is a stylised representation of a metal arrowhead, comprising a tang and two barbs meeting at a point. It is a symbol used traditionally in heraldry, most notably in England, and later by the British government to mark government property. Erected before 1855 when the Board of Ordnance was disbanded and replaced by the War Department. The stone had an earlier number beneath the No. 4 which has been removed and a line put through it, beneath this there are the letters 0 ft. Front. The Board of Ordnance were the custodian of the lands, depots and forts required for the defence of Britain and Ireland.