O5 refers to US government military pay grade. Enlisted soldiers are grades starting with E, such as E3. The lower the number the lower rank the person is. So a Private is E1. W grades are for Warrant Officers. O grades are officers. O1 being 2nd Lieutenant or Ensign, the lowest officer grade. You've asked for O5 that is a Lt. Colonel or Commander. Pay rate is determine by several factors Combat, Flight, Hazardous Duty, etc... Straight base pay for an O5 grade is $46,000 up to $76, 000 based on years in the military. This pay scale is consistent across all of the armed forces.
No such material as O5.
o5 is not a number but an alphanumeric string.
.o5
5
18.6gms dissolved in 1000ml distilled water
-2
c6 h12 o5
Dinitrogen pentoxide.
unlikely
2.O5
The meaning is 5 oxygen atoms.