sol

soil, earth; ground; floor

From Latin solum (“soil, ground, floor”).

sol (the fifth step (G) in the solfège scale of C, preceded by fa and followed by la)

Related: clef de sol

From Latin sol(ve) in the hymn for St. John the Baptist where all note names were taken from.

a Spanish-American gold or silver coin, now the main currency unit of Peru (also new sol), or a coin of this value

From Spanish sol (“sun”), itself from Latin sol.

sou (the feudal era coin)

From Latin solidus, a Roman coin. This form kept the historical spelling based on the Old French and Latin. See the main entry at sou.