- a unit of length, 10−15 m, used in measuring nuclear distances. Symbol: F
- Italian physicist, in the U.S. after 1939: Nobel Prize 1938.
- a unit of length used in nuclear physics equal to 10 –15 metre
- Enrico (enˈriːko). 1901-54, Italian nuclear physicist, in the US from 1939. He was awarded a Nobel prize for physics in 1938 for his work on radioactive substances and nuclear bombardment and headed the group that produced the first controlled nuclear reaction (1942)
