~~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 (or smoke, soot, dust, etc.) and losing temperature, never raining. Similar to water ices and ammonia ices found in Jupiter and Saturn. Navyean will becomes Cryotholian Methanean when it ejected.

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) composition types of clouds/hazes over thick atmosphere of hydrogen and helium (for Jovian planets):
-Letter - Demonymic name: Chemical composition (Hex color)
-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 (#c4eeff)
-P - Springian: 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 - Navyean (Hot version of Methanean): 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)