- it has no inertia, its departing velocity with respect to the emitter is always the same (provided it does not find obstacles on its way),
- it has a very simple polarization, when correctly oriented, it passes through a wire grid,
- when constrained between two limits, its frequency may take only discrete values,
- many photons with the same polarization may be beamed together,
- in the quantum ocean of other quantum particles (essentially other photons or neutrinos), one photon creates and interacts with (we say interfers with) the wave it generates in that ocean (physicists speak of a field).
Such a particle may be represented by a rotating arrow whose rotational plane has a constant orientation between two obstacles.
This common sense way of interpreting Quantum Mechanics is explored at Wikiversity/Making_Sense_of_Quantum_Mechanics.