He was born on September 4, 1954 in Ocotlán de Morelos, Oaxaca, Mexico and trained for his professional wrestling career under Billy Robinson, Chamaco Azteca and El Carnicero.
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Antonio Sánchez Rendón (both September 4, 1954 in Ocotlán de Morelos, Oaxaca, Mexico), is a retired Mexican luchador, or professional wrestler best known under the ring name El Signo (Spanish for "The Sign").