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NA, N.A., Na, or n/a may refer to:




  • Na or 羅, a Korean surname related to the Chinese surname Luo
  • Na, a particle used in Thai noble names


Science and technology[edit]

Biology and medicine[edit]

  • Na (tree) or Mesua ferrea, a species of tree native to Sri Lanka
  • Neuroacanthocytosis, neurological conditions in which the blood contains misshapen, spiculated red blood cells called acanthocytes
  • Nomina Anatomica, a former international standard for human anatomical nomenclature
  • Noradrenaline or norepinephrine, a hormone
  • Nucleic acid analogue, compounds analogous to naturally occurring RNA and DNA, used in medicine and in molecular biology

Other uses[edit]

See also[edit]