Nic: An abbreviation for Nicotine.
Nic-Juice: A slang term to denote an e-liquid with nicotine; it would NOT be used for e-liquid with zero nicotine.
Nichrome: One of the two main types of resistance wire used for the heating coil in an atomizer or cartomizer. The other is Kanthal.
NiMH: Ni-MH stands for Nickel-Metal Hydride. Nickel-Metal Hydride batteries have no Cadmium added. Cadmium is hazardous to the environment. When using Nickel-Metal Hydride batteries, charging should be monitored to avoid overcharging. Nickel Metal Hydride has no memory effect and can be charged or topped off at any time without affecting battery life.
Nicotine: An alkaloid found in tobacco and other plants of the nightshade family.
Nicotine Level: The nicotine level is the amount of nicotine present in a cartridge or bottle of e-liquid. It is usually measured in mg/ml.
Niquid: A generic slang term for e-liquid with nicotine added. Sometimes this liquid has no flavouring, other times it does.
No-Resistance Wire: The heating coils in some Rebuildable Atomizer(RBA) installs require no-resistance wire leads to be attached. They allow for current to get to the heating coil through them, but the portion that is no-resistance will not get hot. The two types that are generally used are silver and nickel.
NRT: An acronym for Nicotine Replacement Therapy.