"invariant" - key terms from Wikipedia

adiabatic invariant
algebraic invariant
class invariant
diffeomorphism invariant
gauge invariant
invariant
invariant	chain
invariant	human
invariant	mass
invariant	mod
invariant	sections
invariant	sets
invariant	subspace
invariant	theory
invariant	to rotations
invariant	under
knot invariant
left invariant	vector fields
no invariant	sections
partially invariant
time invariant
topological invariant
translation invariant