Sub-zero literally means "beneath zero." As such, it is usually used for negative numbers; the most common usage refers to negative temperature.
Sub-zero can also refer to:
Subzero ("Subbie") (foaled 1988 in Australia) was a Thoroughbred racehorse who won the 1992 Melbourne Cup. Trained by Lee Freedman and ridden by veteran jockey Greg Hall, the four-year-old reveled in the rain-affected going to defeat the favourite Veandercross and the two-miler Castletown. The win was to be Subzero's last, but, as one of the few grey winners of the race in the post-War era, his fame was assured.
Upon retirement from racing, the big, near-white gelding with a lovely temperament was employed as the clerk of the course's horse by Racing Victoria's long-time Clerk, Graham Salisbury, and has made numerous appearances on television, at charity functions, and at schools. In July 2008, he was fully retired as he had developed arthritis.
In October 2009, it was reported that Subzero may need to be put down as the medication he needs for his arthritis was unavailable in Australia.
However the medication was subsequently sourced from the United States, and Subzero continues to appear in public, gentle natured these days, very patient with children and still with Graham Salisbury.
Subzero is a New York-based punk metal band that was formed in 1989. The band was created by Rich Kennon of NYHC band Breakdown and Jim Eaton of the New York-based straight edge band Up Front. After hooking up with singer Lou Di Bella and bassist Larry Susi who had played in various local bands in the New York area together, Subzero was finalized. Subzero is one of the longest active bands in the New York hardcore scene, despite a period of inactivity in the late 1990s due to singer Lou Di Bella's bout with Acute lymphoblastic leukemia. He claims his harrowing experiences while in the hospital and numerous brushes with death have made him into a stronger person, evidenced by the lyrics to "Lionhearted", as well as a tongue-in-cheek tattoo across his sternum reading "Cancer Killah". Subzero have toured the world many times over as headliners and as a support group under national acts as well. They've shared the stages with an array of prominent acts such as Slayer, Hatebreed, Megadeth, Motörhead, The Misfits, Sick of It All, Rancid, Cro-Mags, Killswitch Engage, Napalm Death, Iron Maiden, Cannibal Corpse, Eminem and others. They've headlined every major club in Japan, played all the major festivals in Europe. They were one of the first 5 American hardcore bands to ever tour Japan to sold out audiences. Subzero retains their underground ethics and frequently play small clubs, basements and dive bars.