Quaternary (disambiguation)

Quaternary may refer to:

Quaternary (or quartary), the fourth geologic time period
Quaternary numeral system (base-4) in mathematics
- Quaternary counting system in linguistics
Quaternary (EP), an extended play recording by Mötley Crüe
Quaternary structure in structural biology
Quaternary compound, in which an atom is attached to four other atoms, usually carbon
- Quaternary ammonium cation
Quaternary sector of the economy, which encompasses knowledge-based services

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