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In page Nitrox:

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Nitrox is known by many names: Enriched Air Nitrox, Oxygen Enriched Air, Nitrox, EANx or Safe Air.[1][2] Since the word is a compound contraction or coined word and not an acronym, it should not be written in all upper case characters as "NITROX",[1] but may be initially capitalized when referring to specific mixtures such as Nitrox32, which contains 68% nitrogen and 32% oxygen. When one figure is stated, it refers to the oxygen percentage, not the nitrogen percentage. The original convention, Nitrox68/32 became shortened as the first figure is redundant.[citation needed]