List of British Ordnance Terms - HA/LA

HA/LA

High Angle / Low Angle : a naval designation, equivalent to "dual purpose", for a weapon intended for engaging both surface targets and aircraft, on a mounting capable of elevating above 50 degrees but also effective at low elevations. Typical examples were the QF 4 inch Mk XVI, QF 5.25 inch gun and QF 4.5 inch gun used in World War II and later.