SUUNTO Stinger - Manual (Page 113)

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No-decompression dive
Any dive which permits a direct, uninterrupted ascent to the
surface at any time.
NO DEC TIME Abbreviation for no-decompression time limit.
OEA = EAN = EANx Abbreviation for Oxygen Enriched Air Nitrox.
OLF
Abbreviation for Oxygen Limit Fraction.
OTU Abbreviation for Oxygen Tolerance Unit.
Oxygen Tolerance Unit
Is used to measure the Whole-Body-Toxicity.
Oxygen Limit Fraction
A term used by SUUNTO for the values displayed in the
Oxygen Toxicity bar graph. The value is either the CNS% or
the OTU%.
O
2
% Oxygen percentage or oxygen fraction in the breathing gas.
Standard air has 21% oxygen.