See also: Appendix:Variations of "soli" English Etymology From its position as the first planet out from the Sun (Sol). Proper noun Sol I (poetic, science fiction) The planet Mercury. Coordinate terms SolSol IISol IIISol IVSol VSol VISol VIISol VIIISol IXSol X Anagrams LOIs, Lois, oils, silo, soil Wikiwand - on Seamless Wikipedia browsing. On steroids.