noun

• (historical) Various medieval and early modern coins or units of account
• A Roman ~23k gold coin introduced by Diocletian in AD 301 and called by that name, but reissued at a slightly lower weight by Constantine I.
• Its successor Byzantine coins, from the eleventh century onward of progressively debased weight and purity.
• (obsolete) Synonym of sol or sou: a Carolingian unit of account equivalent to a solidus of silver.
• (obsolete) Synonym of soldo: the silver coins of various Italian states.
• (obsolete) Synonym of shilling: an English unit of account and, following the Tudor dynasty, silver coin.
• (historical) The weight of the Roman gold coin, 1/60 of a Roman pound under Diocletian or 1/72 lb. (about 4.5 grams) after Constantine.
• (historical) A medieval French weight, 1/20 of the Carolingian pound.
• (typography) Synonym of slash ⟨/⟩, originally (UK) in its use as the shilling mark and now its formal designation by the ISO and Unicode.
• (typography) The formal name of the oblique strikethrough overlay (as in A̷ and B̸) in Unicode.
• (typography) The division line between the numerator and the denominator of a fraction, whether horizontal or oblique.
• (chemistry, physics) The line in a phase diagram marking the temperatures and pressures below which a given substance is a stable solid.