~~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, primarily made of hydrogen and helium

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
-Azotic: Nitrogen clouds

Planetological specials:
-Europan (for Glacian planets): Planets have subsurface oceans
-Cytherean: Planets are completely cloaked by clouds
-Terramare: Planets have continents and oceans on its surface
-Chthonian (for non-Jovian planets): Planets lost envelope of hydrogen and helium
-Genesian: Artificial planets are constructed
-Cryotholian (for Jovian planets): Below temperature zone, Jovian planets have permanent non-cloud (haze or smoke, soot, dust, snow, etc.) of aerosol types, and losing temperature, never raining. Navyean will becomes Cryotholian Methanean when it ejected.

Evolutionary stages 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)

Aerosol composition types of clouds/hazes over thick atmosphere of hydrogen and helium (for Jovian planets):
-Letter - Demonymic name (Temperature zone for non-Cryotholian planets, where it can be found commonly): Chemical composition (Hex color)
-H - Frigidian (Cloud, 5-20 K): None (H or He). Clear and pristine, devoid of chemistry. (#f5f6ff)
-X - Neonean (Cloud, 15-35 K): Ne (#ffebeb)
-N - Lilacean (Cloud, 35-60 K): N2, CO, O2 (#fdf5ff)
-M - Methanean (Cloud, 55-90 K): CH4, C2H6, Ar (#c4eeff)
-P - Springian (Haze, 90-350 K): Organic compounds and sulfur (#73e6b8)
-T - Tholinian (Haze, 60-550 K): Tholin, but nitrogen and methane, like atmosphere of Titan (#ffad66)
-S - Sulfurian (Cloud, 80-200 K): H2S, NH3, (NH4)HS, SO2 (#fff2ba)
-A - Ammonian (Cloud, 75-190 K): NH3, NH4HS, (NH4)2S. H2S, H2O (#ffe8bf)
-W - Waterian (Cloud, 170-360 K): H2O (#ffffff)
-V - Acidian (Cloud, 200-570 K): H2SO4, H3PO4, NH4H4PO4, H2O (#fff8d4)
-C - Navyean (Haze, >350 K): CH4. Hot cloudless subset of Methanean. (#0077a6)
-G - Thiosulfian (Haze, 400-1000 K): Sulfur and organosulfur compounds. (#cccc7a)
-L - Siliconelian (Haze, 550-1000 K): Siloxane and fluorosiloxane. (#ccffff)
-Z - Chloridian (Cloud, 620-900 K): CsCl, RbCl, KCl, ZnS (#edfae1)
-K - Alkalian (Cloud, 800-1150 K): LiF, Li2S, Na2S, NaCl (#f2f1aa)
-Y - Manganean (Cloud, 1100-1500 K): Cr, MnO, MnS (#4a766e, #d07d92)
-E - Silicatian (Cloud, 1200-1900 K): Fe, FeO, MgO, SiO2 (#3b3b3b)
-R - Rutilian (Haze, 1400-2000 K): TiO, TiO2, VO2 (#151212)
-U - Corundian (Cloud, 1700-2350 K): Al2O3, CaO, calcium aluminates, perovskite (#225ab5, #ccc9b8)
-B - Carbidian (Cloud, 2000-2900 K): TiC, CaC2, VC, VC2, TiN, VN (#6b6966)
-F - Fuliginian (Haze, 2600-3400 K): C (#030004)