Pyrophosphate is a polyvalent anion with a high affinity for polyvalent cations, e.g. Ca. Intercalation mechanisms have been studied for polyvalent cations as well. Vaccines may be "monovalent" (also called "univalent") or "multivalent" (also called "polyvalent"). A mamba-specific antivenom was introduced in 1962, followed by a fully polyvalent antivenom in 1971. If that preparation is not available, tiger snake or polyvalent antivenom should be used. From this they termed a "group" as a polyvalent atom connected together with its ligands. A mordant is often a polyvalent metal ion, often chromium(III). At least six different polyvalent antivenoms are available. Currently, polyvalent antivenoms is available in India and Indonesia. Many signs in the script were polyvalent, having both a syllabic and logographic meaning. The coastal fishing fleet comprises polyvalent, purse seine and trawl fishing vessels. CEGEP institutions are polyvalent offering both pre-university and technical programs. The term "nondualism" and the term ""advaita"" from which it originates are polyvalent terms. It is in the immediate vicinity of the new Polyvalent Hall.