F18

F18, F-18 or F.XVIII may refer to:

Transportation and military

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Other uses

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  • Fluorine-18 (F-18), an unstable isotope of fluorine
  • Slip F-18, fictional anchorage for the houseboat in the novel series starting with The Deep Blue Good-by
  • Formula 18, a class of catamaran
  • F18, a block in chapter V of ICD-10 for "Mental and behavioural disorders due to use of volatile solvents"