Subatomic particles that may be elemental and indivisible. Objects made up of quarks are known as hadrons; other examples are protons and neutrons.
A term for an atom or iota of quantum information, similar to the bit or byte for classical information.
A cosmological term for a real form of substance or energy distinct from any normal matter or radiation, or even "dark matter." Rather than a force of attraction as gravity, its repulsive nature is seen to cause the universe to accelerate apart.