For example, radio frequencies are divided into multiple levels of band divisions and subdivisions, and rather than octaves, the highest level of radio bands (VLF, LF, MF, HF, VHF, etc.)
Any useful subdivision of acoustic frequencies is possible: Fractional octave bands such as 1 / 3 or 1/ 12 of an octave (the spacing of musical notes in 12 tone equal temperament) are widely used in acoustical engineering.
Note that 1000.000 Hz, in octave 5, is the nominal central or reference frequency, and as such gets no correction.
Due to slight rounding errors between the base two and base ten formulas, the exact starting and ending frequencies for various subdivisions of the octave come out slightly differently.
Normally the difference is ignored, as the divisions are arbitrary: They aren't based on any clear or abrupt change in any crucial physical property.
However, if the difference becomes important – such as in detailed comparison of contested acoustical test results – either all parties adopt the same set of band boundaries, or better yet, use more accurately written versions of the same formulas that produce identical results.