~~Planetological classification system
Surface composition types:
-Ferridian: Iron
-Selenian: Rocky and silicate
-Carbidian: Carbonaceous
-Glacian: Solid of sea fluid types such as ices, sulfurs, quartzes
-Jovian: 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 subtypes:
-Greenhouse: Carbon dioxide clouds
-Misty: Water clouds
-Titanian: Orange clouds of Titan-like planets

Planetological specials:
-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: Jovian planets have permanent chromochemical hazes. These planets exhibit wide range of chromochemical compositions, with the exception of MesoAzurian and PyroAzurian types, MesoAzurian/PyroAzurian planets will transform into 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: Chemical composition (Hex color)
-J - CryoAzurian: CH4 (#c4eeff)
-H - Frigidian: None (H or He). Clear and pristine, devoid of chemistry. (#f5f6ff)
-X - Neonean: Ne (#ffebeb)
-N - Lilacean: N2, CO, O2 (#fdf5ff)
-M - Methanean: CH4, C2H6, Ar (#def6ff)
-P - MesoAzurian: Organic compounds and sulfur (#73e6b8)
-T - Tholinian: Tholin, but nitrogen and methane, like atmosphere of Titan (#ffad66)
-S - Sulfurian: H2S, NH3, (NH4)HS, SO2 (#fff2ba)
-A - Ammonian: NH3, NH4HS, (NH4)2S, H2O (#ffe8bf)
-W - Waterian: H2O (#ffffff)
-V - Acidian: H2SO4, H3PO4, NH4H4PO4, H2O (#fff8d4)
-C - PyroAzurian: CH4 (#0045a6)
-G - Thiosulfian: Sulfur and organosulfur compounds. (#cecda0)
-L - Siliconelian: Siloxane and fluorosiloxane. (#998c7e)
-Z - Chloridian: CsCl, RbCl, KCl, ZnS (#9bab7f)
-K - Alkalian: LiF, Li2S, Na2S, NaCl (#271f1d)
-Y - Erythronian: Cr, MnO, MnS (#9b2d2d, #c75830)
-E - Silicatian: Fe, FeO, MgO, SiO2 (#7e8c77, #788a8d)
-R - Rutilian: TiO, TiO2, VO2 (#141313)
-U - Corundian: Al2O3, CaO, calcium aluminates, perovskite (#e24c4c, #f28356, #e49393)
-B - Carbidian: TiC, CaC2, VC, VC2, TiN, VN (#292017)
-F - Fuliginian: C (#030004)