~~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.
-Hydronian: Clouds of hydrogen and helium. As Chthonian planets, it almost lost envelope of hydrogen and helium, resembles Frigidian version of Venus.

Surface types:
-Terramare: Planets have continents and oceans on its surface.
-Cytherean: Planets are completely cloaked by clouds and supercritical fluids, resembling Venus.
-Europan (for Glacian planets): Planets have subsurface oceans.
-Martian: Desert planets with 0% sea level, surface is covered by sands and oxides.
-Oceanic: Ocean planets with 100% sea level.
-Airless: Planets lack atmospheres.

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 (Surface and subglacial):
-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-Permatholian planets, where it can be found commonly; hex color): Chemical composition
-A - CryoAzurian (Clarified, 5-90 K; #c4eeff): CH4.
-B - Frigidian (Cloud, 5-20 K; #f5f6ff): None. Clear and pristine, devoid of chemistry.
-C - Neonean (Cloud, 15-35 K; #ffebeb): Ne.
-D - Lilacean (Cloud, 35-60 K; #fdf5ff): N2, CO, O2.
-E - Methanean (Cloud, 55-90 K; #c4f8ff): CH4, C2H6, Ar
-F - MesoAzurian (Clarified, 90-550 K; #41d9d9): Organic compounds and sulfur
-G - Tholinian (Haze, 60-550 K; #ffad66): Tholin, but nitrogen and methane, like atmosphere of Titan.
-H - Sulfurian (Cloud, 80-200 K; #fff2ba): H2S, NH3, (NH4)HS, HCl, SO2.
-I - Ammonian (Cloud, 75-190 K; #ffe8bf): NH3, NH4HS, (NH4)2S, H2O, CO2.
-J - Waterian (Cloud, 170-360 K; #ffffff): H2O.
-K - Acidian (Cloud, 200-570 K; #fff8d4): H2SO4, H3PO4, NH4H4PO4, H2O, NH4Cl.
-L - PyroAzurian (Clarified, 550-1100 K; #0077a6): CH4.
-M - Thiosulfian (Haze, 400-1000 K; #cccc7a): Sulfur and organosulfur compounds.
-N - Siliconelian (Haze, 550-1000 K; #7d9999): Siloxane, fluorosiloxane, and other organosilicon compounds.
-O - Chloridian (Cloud, 620-900 K; #edfae1): CsCl, RbCl, KCl, ZnS.
-P - Alkalian (Cloud, 800-1150 K; #59593e): LiF, Li2S, Na2S, NaCl.
-Q - Manganean (Cloud, 1100-1500 K; #4a766e, #d07d92): Cr, MnO, MnS.
-R - HyperPyroAzurian (Clarified, >1100 K; #0047ab): CH4.
-S - Silicatian (Cloud, 1200-1900 K; #667d80, #688066): Fe, FeO, MgO, SiO2.
-T - Rutilian (Haze, 1400-2000 K; #0d0904): TiO, TiO2, VO2. [Example: TrES-2b]
-U - Corundian (Cloud, 1700-2350 K; #225ab5, #ccc9b8): Al2O3, CaO, calcium aluminates, perovskite.
-V - Carbidian (Cloud, 2000-2900 K; #1a1310): TiC, CaC2, VC, VC2, TiN, VN, SiC.
-W - Fuliginian (Haze, 2600-3400 K; #030004): C.