No ?
It's a scale system measuring the dicks of Beasts or their SG energy output.
Baby Whore and Olga are third Planetary. The later is quoted as being able to output the same energy as a star , which is honestly nothing new since you have shit like Amaterasu or Chaos which uses a a star as a battery.
Goetia is second and baby Tiamat is propably the same since she has nearly the same output of Goetia , give or take.
Whore is first class.
When you reach this kind of output, you need to be put down with Planetary scale weapons.