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12 sectionsContents
- Chemistry and physics
- Biology and medicine
- Places
- Current
- Historical
- Names and titles
- Art and entertainment
- Transport
- Language
- Organizations
- Other uses
- See also
NA, N.A., Na, nA or n/a may refer to:
==Chemistry and physics== Sodium, symbol Na, a chemical element Avogadro constant (NA) Nucleophilic addition, a type of reaction in organic chemistry Numerical aperture, a number that characterizes a range of angles in an optical system nA, the symbol for nanoampere Naturally aspirated engine
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Namibia
Country
North America
Entity
Naples
Entity
sodium
Entity
North Africa
Entity
Netherlands Antilles
Entity
ampere
Entity
.na
Entity
Nauruan
Entity
Avogadro constant
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norepinephrine
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Nana
Entity
Nepal Airlines
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な
Entity
Mesua ferrea
Entity
N/A
Entity
National Alliance
Entity
Narcotics Anonymous
Entity
Mosuo
Entity
Shimmer and Shine
Entity