Not Really, use what every you want.
Usually though They go Major.Minor.
So first number major releases, Minor changes and bug fixes for the second number. Before the first full release ther usually marked 0 for the first number.
Beyonf that theres no Real guide. Use something obvious and sensible.
The LInux Kernels follow Major.Minor.Patch Although Minor usually isn't so Minor
. The Even number Minors are stable the odd numbers are Alpha/Beta.