of a spoken language in the way that the writing systems of the Old World or the Maya Script did. Therefore, generally Aztec writing was not meant to be read, but to be told. The elaborate codices were essentially pictographic aids for memorizing texts, which include genealogies, astronomical information, and tribute lists. Three kinds of signs were used in the system: pictures used as mnemonics (which do not represent particular words), logograms which represent whole words (instead of phonemes or syllables), and logograms used only for their sound values (i.e. used according to the rebus principle). However, epigrapher Alfonso Lacadena has argued that by the eve of the Spanish invasion, one school of Nahua scribes, those of Tetzcoco, had developed a fully syllabic script which could represent spoken language phonetically in the same way that the Maya script did. Some other epigraphers have questioned the claim, arguing that although the syllabicity was clearly extant in some early colonial manuscripts (hardly any pre-Columbian manuscripts have survived), this could be interpreted as a local innovation inspired by Spanish literacy rather than a continuation of a pre-Columbian practice. The Spanish introduced the Latin script, which was used to record a large body of Aztec prose, poetry and mundane documentation such as testaments, administrative documents, legal letters, etc. In a matter of decades pictorial writing was completely replaced with the Latin alphabet. No standardized Latin orthography has been developed for Nahuatl, and no general consensus has arisen for the representation of many sounds in Nahuatl that are lacking in Spanish, such as long vowels and the glottal stop. The orthography most accurately representing the phonemes of Nahuatl was developed in the 17th century by the Jesuit Horacio Carochi, building on the insights of another Jesuit, Antonio del Rincon. Carochi's orthography used two different diacritics: a macron to represent long vowels and a grave for the , and sometimes an acute accent for short vowels. This orthography did not achieve a wide following outside of the Jesuit community. When Nahuatl became the subject of focused linguistic studies in the 20th century, linguists acknowledged the need to represent all the phonemes of the language. Several practical orthographies were developed to transcribe the language, many using the Americanist transcription system. With the establishment of Mexico's Instituto Nacional de Lenguas Indígenas in 2004, new attempts to create standardized orthographies for the different dialects were resumed; however to this