Give me your best jargon.
I’m compiling a list of jargon that represent fundamental ideas about different fields. You have any? Please give the word – short definition and where it is used. For example:
Hamiltonian is the operator corresponding to the total energy of the system – Quantum Mechanics.
Leader is the piece of intermediate light material that attaches a fly line to the fly. -Fly Fishing
Reciprocity is the correlation between aperture and shutter speed that results in the same exposure. – Photography