~~Planetological classification system
Surface composition types:
-Iron
-Rocky
-Carbonaceous
-Ice
-Gaseous

Sea level (for Terramare planets):
-Oceanic: 100%
-Pelagic: 90-100%
-Marine: 60-90%
-Estuarine: 40-60%
-Lacustrine: 10-40%
-Arid: 0-10%
-Desert: 0%

Cytherean type:
-Greenhouse: Carbon dioxide clouds
-Misty: Water clouds
-Titanian: Orange clouds of Titan-like planets

Planetological special:
-Europan: Planets have subsurface oceans
-Cytherean: Planets are completely cloaked by clouds
-Terramare: Planets have continents and oceans on its surface
-Chthonian: Planets lost envelope of hydrogen and helium
-Genesian: Artificial planets are constructed
-Cryotholian: Gaseous planets below temperature zones that it can be found most commonly, gaseous planets have permanent chromochemical hazes and losing its temperature, never raining. Common found in Saturn is water ice and ammonia ice, all chromochemical types of Cryotholian gaseous planets are diverse but except MesoAzurian and PyroAzurian, ejected MesoAzurian/PyroAzurian gaseous planets will become Cryotholian CryoAzurian.

Evolutionary stage of life:
-Protobiotic: Worlds undergoing abiogenesis, rich in prebiotic molecules like protocells and other life-like organisms. Usually only a brief phase, but may become greatly extended by various planetary factors.
-Microbiotic: Most common type of biotic world. These worlds host microbial life, often of low complexity.
-Mesobiotic: Worlds with simple colonial, multicellular, and/or megacellular organisms.
-Macrobiotic: Worlds hosting a well developed ecosystem of macroscopic multicellular, colonial, and/or megacellular organisms.
-Neobiotic: Worlds that have had life introduced from another world or heavily modified by artificial means.
-Postbiotic: Worlds that had once hosted life which has since completely died out.

Sea fluid types (Terramare and Europan):
-Wateric: H2O
-Ammonic: NH3
-Methanic: CH4
-Sulfic: H2S
-Nitric: N2
-Nitroxic: NO2
-Brimstonic: S (molten sulfur)
-Cyanogenic: (CN)2
-Carboxic: CO
-Neonic: Ne
-Helic: He
-Oxygenic: O2
-Hydric: H2
-Carbonylic: Iron carbonyl
-Saltic: NaCl (molten salt)
-Quartzic: SiO2 (molten silica)

Chromochemical (Color-chemistry) types (for gaseous planets):
-Letter - Demonymic name (Temperature zone, it can be found most commonly): Chemical composition (Hex color)
-J - CryoAzurian (5-90 K): CH4 (#c4eeff)
-H - Frigidian (5-20 K): None (H and He). Clear and pristine, devoid of chemistry. (#f5f6ff)
-X - Neonean (15-35 K): Ne (#ffebeb)
-N - Lilacean (35-60 K): N2, CO, O2 (#fdf5ff)
-M - Methanean (55-90 K): CH4, C2H6, Ar (#def6ff)
-P - MesoAzurian (90-350 K): Organic compounds and sulfur (#73e6b8)
-T - Tholinian (60-550 K): Tholin, but nitrogen and methane, like atmosphere of Titan (#ffad66)
-S - Sulfurian (80-200 K): H2S, NH3, (NH4)HS, SO2 (#fff2ba)
-A - Ammonian (75-190 K): NH3, NH4HS, (NH4)2S, H2O (#ffe8bf)
-W - Waterian (170-360 K): H2O (#ffffff)
-V - Acidian (200-570 K): H2SO4, H3PO4, NH4H4PO4, H2O (#fff8d4)
-C - PyroAzurian (>350 K): CH4 (#0045a6)
-G - Thiosulfian (400-1000 K): Sulfur and organosulfur compounds. (#cecda0)
-L - Siliconelian (550-1000 K): Siloxane and fluorosiloxane. (#998c7e)
-Z - Chloridian (620-900 K): CsCl, RbCl, KCl, ZnS (#9bab7f)
-K - Alkalian (800-1150 K): LiF, Li2S, Na2S, NaCl (#271f1d)
-Y - Erythronian (1100-1500 K): Cr, MnO, MnS (#9b2d2d, #c75830)
-E - Silicatian (1200-1900 K): Fe, FeO, MgO, SiO2 (#7e8c77, #788a8d)
-R - Rutilian (1400-2000 K): TiO, TiO2, VO2 (#141313)
-U - Corundian (1700-2350 K): Al2O3, CaO, calcium aluminates, perovskite (#e24c4c, #f28356, #e49393)
-B - Carbidian (2000-2900 K): TiC, CaC2, VC, VC2, TiN, VN (#292017)
-F - Fuliginian (2600-3400 K): C (#030004)