Planetary classification system

=== Type ===
A planet's type was related to its atmosphere and surface.
There are various types:
Type 	Description
Atmosphere 	Atmosphere
! 	No atmosphere
Breathability	Breathability
A 	Breathable atmosphere
B 	Breathing filter recommended
C 	Breathing filter required
D 	Breathing tank required
Radiation 	Radiation
A 	No protection required
B 	Protection required
C 	Protection required + limited exposure
D 	Structural shielding required
Surface 	Surface
A 	Safe
B 	Caution required
C 	Unsafe
D 	Dangerous/fatal
The planet's type was written as: "! A.B.C".
=== Level ===
A planet's level was related to its technological development. The higher the designation, the more advanced they were.
Moons and other object use the same classification system but are independent from their planet's classification.
There are 7 levels:
Level 	Description
Level 1	Uninhabited or uninhabitable planets
Level 2	Planets with no sentient life
Level 3	Planets with basic sentient life
Level 4	Planets with intelligent life
Level 5	Planets with technology capable of intra-systemic travel (only within the star system)
Level 6	Planets with inter-systemic travel (outside the star system)
Level 7	Planets with powerful technologies, such as teleportation or time travel, etc.
=== Grade ===
A planet's grade was related to the safety and happiness of its inhabitants. The safer and happier they were, the higher the designation.
There are 9 grades:
Grade	Description	Origin
PD 	 	"Paradise"
WT 	 	"White"
QE 	 	"Quiet"
FO 	 	"Float"
EV 	 	"Even"
SK 	 	"Sink"
NS 	 	"Noise"
BK 	 	"Black"
HE 	 	"Hell"