That is Russian language: the translation of it is: hand anti-tank grenade launcher. It is nothing to do with science though...

you get a plasma grenade then you get a rocket launcher.first you throw the grenade then shoot the tank with a rocket launcher.

Handguns
§ Enfield Revolver No.2 Mk.I
§ Webley Mk.VI (.455) & Mk.IV (.38/200)
§ FN/Inglis Pistol No.2 Mk.I and Mk 1*
§ Smith & Wesson M&P
§ Colt M1911A1
§ Welrod
Rifles
§ Short Magazine Lee-Enfield
§ Rifle No. 5 Mk I
§ Pattern 14 (P14) "No.3"
§ De Lisle Carbine (Limited to British Commandos)
§ M1 carbine
Submachine guns
§ Sten - about 4 million produced from all sources
§ Lanchester
§ Thompson M1928, M1928A1, M1
Machine Guns
§ Bren light machine gun
§ Lewis light machine gun
§ Vickers K machine gun
§ Vickers machine gun
§ Besa machine gun
§ M2 Browning machine gun
Anti-Tank Weapons
§ Projector, Infantry, Anti-Tank (PIAT)
§ Rifle, Anti-Tank, .55 in, Boys
Grenades
§ No.36M Mk.I Fragmentation Hand/Rifle Grenade or "Mills Bomb"
§ Grenade, Rifle No. 68 AT - HEAT anti-tank rifle grenade
§ No.69 Mk.I Bakelite Concussion Hand Grenade
§ No.76 Special Incendiary Phosphorus Hand Grenade
§ No.73 Anti-Tank Hand Grenade "Thermos Grenade"
§ No.74 ST Grenade, or "Sticky Bomb" - an anti-tank hand grenade
§ No.75 Anti-Tank Hand Grenade known as "Hawkins Grenade" or "Hawkins Mine"
§ No.77 (White Phosphorus) Hand Grenade
§ No.82 Hand Grenade - known as "Gammon Grenade/Bomb"
Mortars
§ 2-inch mortar
§ Ordnance ML 3 inch Mortar
Flamethrowers
§ No.II Mk.II Flamethrower "Lifebuoy"
Sniper rifles
§ Lee-Enfield (scoped)
§ Pattern 1914 (scoped)
§ M1D Garand (Scoped)
Knives
§ Fairbairn-Sykes Fighting Knife

No. The g stands for grenade, and the P stands for propelled. Rocket Propelled Grenade is a Western creation as far as the term goes - the Soviets created the RPG designation, for RuchnoyProtivotankovyy Granatomyot, which translated to something like "Handheld Anti-Tank/Armour Grenade Launcher"

Unlike what most people think, rpg does not stand for rocket propelled grenade, but instead ruchnoy protivotankovyy granatomyot which is Russian. It translates into hand held anti-tank grenade launcher.