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tercia

In Central America, 20ᵗʰ century, a unit of length, literally, a “third.”

Costa Rica	27.866 centimeters (approximately 10.971 inches), a third of a vara. A synonym for the pie. [Costa Rica. Ministerio de formento.] Medidas y pesas del sistema métrico, y tablas de equivalencia con las antiguas. San José de Costa Rica: Imprenta nacional, 1885. United Nations, 1966, page 45.
El Salvador	= 1 foot, 30.48 centimeters, a third of a yard. Also called a pie. United Nations, 1966, page 49.
Guatemala and Nicaragua	28.0 centimeters (approximately 11 inches), a third of a vara. (UN, 1966)
Mexico	279.333 millimeters, a third of a vara. Galván Riviera, 1844. Excerpt in Spanish with English translation.