I've read loads of Preppers' and Survivalists' glossaries and found that most (not all) of them are direct copies of others on the internet, without a thought for a better definition. What I've tried to do here is take the best out of them, simplify the explanations, remove the dross and add things that I believe are essential. If you think that something should be added or better explained then please email me at mal@survival_supplies.co.uk .

ALICE	Military Acronym - All-Purpose Lightweight Individual Carrying Equipment.
As The Crow Flies	The shortest distance between two points, i.e. a straight line.
ATL	Acronym - Attempt To Locate.
Barter	Trading goods or services you have for something you want.
Batoning	Splitting wood down the length of the grain using the sharp edge of a knife and striking the back of the knife with a heavy object (such as another log).
BBE	Acronym - Best Before End. A date usually printed on processed food packs to indicate the product's end of "Shelf Life" (see below).
BIB	Acronym - Bug-In Bag. A kit of essentials designed for use at home.
BOB	Acronym - Bug Out Bag.
BOL	Acronym - Bug Out Location.
BOV	Acronym - Bug Out Vehicle.
Bowie Knife	A long fixed blade knife with a cross guard and clip point, although James Bowie's original knife was described as having a straight back.
Bug Out	Leave home in an emergency.
Calibre	The diameter of a bullet from a gun. The calibre is the measurement (in inches or millimetres) of the inner diameter of the barrel. E.g. a .22 calibre rifle measures approximately .22 inches from one side of the barrel to the other. The inner diameter of the barrel of a 9mm pistol is 9mm.
Char Cloth	A piece of cloth (usually cotton) that has been carbonised by heating in the absence of oxygen, which easily takes a spark to start a fire.
Cluster Fuck	Military term for an operation in which multiple things have gone wrong, occasionally replaced by the NATO phonetic acronym "Charlie Foxtrot."
CYA	Acronym - Cover Your Assets (or Cover Your Arse).
DIY	Acronym - Do It Yourself.
DLP	Acronym - Defence of Life and Property
EDC	Acronym - Every Day Carry. What an individual person caries on them on a daily basis.
ELE	Acronym - Extinction Level Event.
EMP	Acronym - Electromagnetic Pulse
EOTW	Acronym - End Of The World.
Faraday Cage	A shielding enclosure for electronics.
Ferro Rod	A rod of Ferrocerium which, when scraped with a steel, can make hot sparks (1,650 °C) to start a fire. Often misreferred to as a “flint”.
Fiat Currency	Any currency that is issued by government not backed by gold, silver or other tangibles. These days that includes most currencies, including the US Dollar.
Fire Steel	See Ferro Rod.
FIFO	Acronym - First In, First Out - used for food and other degradable stock rotation.
FLC	Acronym - Fighting Load Carrier
Force Multiplier	A capability that, when added to and employed by a combat force, significantly increases the combat potential of that force and thus enhances the probability of successful mission accomplishment.
FUBAR	Military Acronym - Fucked Up Beyond All Repair (US version of SNAFU).
Full Tang	In knife parlance this indicates that the blade and handle are constructed from one continuous piece of metal. Scales or grips are typically attached to the handle portion for a more comfortable grip. This makes for a very robust knife.
Gauge	Refers to number of lead balls the size of the inner diameter of a shotgun that it would take to make a pound. E.g. a 12-gauge shotgun means that it would take 12 lead balls the size of the inner diameter of the barrel to weigh a pound. So, in the case of a 20-gauge shotgun, 20 lead balls the size of the inner diameter of the barrel would weigh a pound.
Get-Home Bag	This is a smaller light weight bag you keep in your car to help you get home.
Grid-down	A situation where the National Electrical Grid has failed - possibly long-term
GMO	Acronym - Genetically Modified Organism
HRC	Rockwell scale of hardness. The higher the number the harder the material. Most bushcraft knives tend to have an HRC of 54 to 60.
INCH	Acronym - I’m Never Coming Home
Isolated Retreat	A privately owned stronghold designed to be entirely self-sufficient and self-contained.
Jimping	Notches/grooves that are machined into the back part of a knife blade or on the knife handle for better grip and/or thumb control.
Kindling	Small dry twigs and sticks used to build a fire.
KISS	Acronym - Keep It Simple, Stupid (i.e. avoid unnecessary complexity).
LOS	Acronym - Line of Sight. Many communications technologies require an unobstructed path between transmitter and receiver, as in microwave radio, satellite communications, and laser/infrared optical communications links.
MAD	Acronym - Mutually Assured Destruction.
MIL-SPEC	Military specification. Something made to military standards
MOLLE	Military Acronym - Modular Lightweight Load-carrying Equipment. MOLLE is a replacement for the All-Purpose Lightweight Individual Carrying Equipment system (ALICE).
MRE	Acronym - Meal, Ready to Eat (usually term for army field rations)
NBC	Nuclear, Biological, Chemical.
Off-Grid	Not connected to the power, water and sewage utility grid; self-sufficient.
Potable	Water that is safe to drink by humans.
PPPPPP	Acronym - Proper Planning Prevents Piss Poor Performance
Prep	Prepare.
Prepper	A person who is prepared for emergency situations.
Preps	Preparations.
PSK	Acronym - Personal Survival Kit
Retreat	A place of refuge that is prepared in advance, usually in lightly-populated rural regions.
Rockwell Scale of Hardness	The Rockwell Scale is a measurement system used bto determine the relative hardness of a material (such as a knife blade) based on the depth of the dentat made by a heavy object impacting them. For knives they use the “C” scale in units labelled HRC (see above).
Rule of 3	The Rule of 3 states that you cannot survive much more than: • 3 minutes without air • 3 hours without shelter in extreme conditions • 3 days without water • 3 weeks without food
SERE	Acronym - Survival, Evasion, Resistance and Escape.
Sheeple	Sheep People - people who mindlessly give up their rights and follow others who they think have authority.
Shelf Life	The useful life of a product. In processed foods it is the time that it can be stored before the manufacturer states that the product may becomes inedible. See also "BBE" above. Also the period of time that a battery can be stored and still have at least 85% of its original charge.
SHTF	Acronym - Shit Hits The Fan.
SITREP	Situation Report
SNAFU	Military Acronym - Situation Normal, All Fucked Up (British version of FUBAR).
SOP	Acronym - Standard Operating Procedure/s
SSSSSS	Acronym - Sound, Shape, Shine, Shadow, Smell, Silhouette.
STOP	Acronym - Stop, Think, Observe, Plan.
TEOTWAWKI	Acronym - The End Of The World As We Know It.
Tinder	Fine flammable material that will easily catch a spark; used to start a fire.
UXB	Acronym - Unexploded Bomb.
WROL	Acronym - Without Rule Of Law.
YOYO	Acronym - You're On Your Own - when you can’t expect help from any of the normal emergency services.