Appendix 11: Glossary of Code Names and Abbreviations
| A.A.S.F | Advanced Air Striking Force. |
| ABIGAIL | Bomber operation in December 1940 designed to produce the ‘maximum possible destruction in a selected German town’. |
| A.D.G.B. | Air Defence of Great Britain. |
| A.I. | Air interception—radar set carried by fighters. |
| A.M.E.S. | Air Ministry Experimental Station (i.e. radar station). |
| A/S. | Anti-submarine. |
| A.S.V. | Air-to-surface vessel—Airborne search and homing radar used for anti-U-boat and anti-shipping operations. |
| BARBAROSSA | (German) Code-name for the invasion of Russia. |
| BATTLE-AXE | Operation to relieve Tobruk—Western Desert, June 1941. |
| BITING | Raid on enemy radar installation at Bruneval, 27/28th February 1942. |
| CIRCUS | Offensive operation by fighters and bombers on the Continent to prevent the withdrawal of the G.A.F. to the eastern front. |
| COLOSSUS | Airborne combined operation against an aqueduct at Tragino on 10/11th February 1941. |
| D.W.I. | Directional Wireless Installation (mine-exploding device on aircraft). |
| DYNAMO | Evacuation from Dunkirk, 26th May–4th June 1940. |
| E.A. | Enemy aircraft. |
| E.T.A. | Estimated time of arrival. |
| EUREKA | Portable ground radio-beacon |
| F.C. | Fighter Catapult (ship). |
| FREYA | German radar installation for long-range detection. |
| FULLER |
Counter-measures against the escape of the Scharnhorst and Gneisenau from Brest. |
| GEE | Medium range radio aid to navigation employing ground transmitters and airborne receiver. |
| G.L. | Gun-laying (radar). |
| G.P. | General Purposes (bomb). |
| HABFORCE | Force sent from Trans-Jordan across desert to relieve Habbaniya in May 1941. |
| HADDOCK | Organization for operating British bombers frm South of France against Italian targets—June 1940. |
| H.E. | High-explosive. |
| HEADACHE | Counter-measures against German navigational beams. |
| I.F.F. | Identification friend or foe—device on aircraft for identifying ‘friendlies’ to radar stations. |
| INTRUDER | Night operations designed to impeded the enemy in his use of airfields. |
| J.G. |
Jagdgeschwader, i.e. German Fighter Group. |
| K.G. |
Kampfgeschwader, i.e. German Bomber Group. |
| K.Gr. |
Kampfgruppe, i.e. German Bomber Wing. |
| KNICKEBEIN | (German) Navigational beam. |
| LAYFORCE | Commando force operating in Middle East. |
| MARITA | (German) Invasion of Greece and Yugoslavia. |
| MOONLIGHT SONATA | (German) Operation against Coventry, November 1940. |
| M.T. | Mechanical transport. |
| MUTTON | The Long Aerial Mine. |
| NICKELS | Leaflets. |
| O.K.L. |
Oberkommando der Luftwaffe, i.e. High Command of the G.A.F. |
| O.K.W. |
Oberkommando der Wehrmacht, i.e. High Command of the German Armed Forces. |
| O.T.U. | Operational Training Unit. |
| P.A.C. | Parachute and Cable defence. |
| P.R.U. | Photographic Reconnaissance Unit. |
| R.D.F. | Radio-direction finding—early name for radar. |
| RHUBARB | Offensive operations by fighters designed to make enemy retain strong air forces in western Europe. |
| R/T. | Radio-telephone. |
| S.A.P. | Semi-armour piercing (bombs). |
| SEALION | (German) Plan for invasion of England—1940. |
| S.L.C. | Searchlight Control (radar). |
| STOPPER | Coastal Command patrol outside Brest. |
| STRAFGERICHT | (German) Bombing of Belgrade—April 1941. |
| STUKA |
Sturzkampfflugzeug, i.e. dive-bomber. |
| T.R.E. | Telecommunications Research Establishment. |
| UMBRELLA | (German) Projected attack on Birmingham—November 1940. |
| U.P. | Unrotating projectile (rocket). |
| V.H.F. | Very high frequency (R/T). |
| WESERÜBUNG | (German) Plan for invasion of Norway and Denmark—1940. |
| W/T. | Wireless telegraphy. |
| WÜRZBURG | (German) Ground radar system used for controlling searchlights, anti-aircraft guns and night-fighter aircraft. |
| X-GERÄT, Y-GERÄT | (German) Navigational radio devices. |
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