Sub-zero
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Subzero literally means "beneath zero." As such, it is usually used for negative numbers, especially with regards to temperature.

Sub-Zero Treatment, also known as cryogenic treatment, utilizes ultra-cold temperatures to modify the micro-structure of metals and other materials. It is part of heat treating operations in manufacturing processes. This process requires temperatures of at least -120°F to begin. For deep sub-zero treatment the parts must cooled to -300°F where they are held for relatively long periods of time and then slowly warmed back up. This treatment has many benefits including:

• Improved stress relief
• Better dimensional stability
• More uniform structural stability
• Improved wear resistance
• Useful technique for shrink fitting

This type of heat-treating production has been widely accepted as a cost reduction process and preformance enhancing technology.^{[1] [2] [3]}

Subzero can also mean:

In popular culture:

• Sub-Zero (Mortal Kombat), one of the characters from the video game series Mortal Kombat.
  • Noob Saibot was the original Sub-Zero, and brother to the younger Sub-Zero.
  • Mortal Kombat Mythologies: Sub-Zero, a spin-off video game.
• Subzero (horse), a racehorse that won the 1992 Melbourne Cup.
• Sub Zero (television), a television gameshow for children produced by the BBC.
• Subzero (band), a "metalcore" band under the Stillborn Records label.
• Batman & Mr. Freeze: SubZero, an animated 1998 movie.
• One of the "stalkers" from the movie The Running Man.

As a title:

• Sub-Zero Refrigerator, a refrigerator brand name.

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