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A unit of length in Spanish-speaking countries (literally, “foot”).

Values in use in the 20^th century:

Spain	approximately 27.84 centimeters (UN 1966)
Argentina, Ecuador, and El Salvador	= 1 foot (30.48 centimeters) (UN 1966)
Costa Rica	41.8 centimeters, a synonym for the tercia. [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.
Honduras	approximately 27.8 centimeters (UN 1966)
Mexico	approximately 27.936 centimeters (UN 1966), = 1/3 of a vara, synonym is tercia. Galván Riviera, 1844. Excerpt in Spanish with English translation.
Paraguay	approximately 28.89 centimeters, where it is also a measure of area. (UN 1966)