A photino is a hypothetical subatomic particle, the fermion WIMP superpartner of the photon predicted by supersymmetry. It is an example of a gaugino. Even though no photino has ever been observed so far, it is expected to be the lightest stable particle in the universe.
Photinos have a lepton number 0, baryon number 0, and spin 1/2. With an R-parity of -1 it is a possible candidate for dark matter. It mixes with the superpartners of the Z boson (zino) and the neutral higgs (higgsino) to the neutralino.
The eyes like fiery embers*
Smoking nostrils and flowing mane
Untamed steed of hell
Sent by death
This black mount as fast as wind
Will lead you to eternal flames
So furious you are riding
Black conqueror
[Chorus:]
Fly like arrow
Through valleys and plains
On the back of the demon horse
Towards the thresholds of the hades
Is the dark conqueror end
Through your kingdom you are flying
You are trying to pull the reins
But the beast is stronger than you
Mad race to the burning chasm