Testerian is a pictorial writing system that was used until the 19th century to teach Christian doctrine to the indigenous peoples of Mexico, who were unfamiliar with alphabetic writing systems. Its invention is attributed to Jacobo de Testera, a Franciscan who arrived in Mexico in 1529.

Testerian
Script type	Pictographic
Creator	Jacobo de Testera
Time period	16th to 19th centuries
Direction	boustrophedon
Languages	Various
This article contains phonetic transcriptions in the International Phonetic Alphabet (IPA). For an introductory guide on IPA symbols, see Help:IPA. For the distinction between [ ], / / and ⟨ ⟩, see IPA § Brackets and transcription delimiters.

Bibliography

• Haberly, David (1963). "The Hieroglyphic Catechisms of Mexico". {{cite journal}}: Cite journal requires |journal= (help)
• Leeming, Ben (2005). "Preaching With Pictures: How Hieroglyphic Catechisms Shaped Native Mesoamerican Christianity in Sixteenth-Century Mexico". {{cite journal}}: Cite journal requires |journal= (help)
• Normann, Anne (1985). "Testerian Codices: Hieroglyphic Catechisms for Native Conversion in New Spain". {{cite journal}}: Cite journal requires |journal= (help)
• Robertson, Donald (1994). Mexican Manuscript Painting of the Early Colonial Period: The Metropolitan Schools. University of Oklahoma Press. pp. 53–55. ISBN 0-585-14632-2.
• Catecismo pictórico Otomí

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