Wikipedia's "Fortran" page has descriptions for both Fortran-5 (Data
General) and Fortran-V (Control Data).

from https://en.wikipedia.org/wiki/Fortran :
> Fortran 5 was marketed by Data General Corp in the late 1970s and
> early 1980s, for the Nova, Eclipse, and MV line of computers. It had
> an optimizing compiler that was quite good for minicomputers of its
> time. The language most closely resembles FORTRAN 66.
>
> FORTRAN V was distributed by Control Data Corporation in 1968 for the
> CDC 6600 series. The language was based upon FORTRAN IV.[64]