In biological classification, subspecies (abbreviated "subsp." or "ssp."; plural: "subspecies") is either a taxonomic rank subordinate to species, or a taxonomic unit in that rank. A subspecies cannot be recognized in isolation: a species will either be recognized as having no subspecies at all or two or more (including any that are extinct), never just one.
"I think so, Brain, but why does a forklift have to be so big if all it does is lift forks?" -Pinky
"My comrades and my beloved, upon your way you shall meet men with hoofs; give them your wings. And men with horns; give them wreaths of laurel. And men with claws; give them petals for fingers. And men with forked tongues; give them honey words." --Kahlil Gibran, The Garden of The Prophet