There have been a few threads in the past, but here are some common ones around here.

SAK = Swiss Army Knife - Those glorius little pocket knives that are a great bang for the buck
EDC = Every Day Carry - All the stuff you carry every day.
PSK = Personal SurvivalKit - Most commonly a small kit that can fit into an Altoids tin, but can be used to describe any survival kit that you would carry. Generally meant to last from 1-3 days.
BOB = Bug-Out Bag - Usually a back-pack sized kit, and is meant to keep you going for an extended period of time.

I hope that helps.


Robert