The Maya had a hieroglyphic writing system that used logograms (symbols that represent whole words) and syllabograms (symbols that represent individual sounds). The Maya script is one of the most complex writing systems ever developed.
The Aztecs had a pictographic writing system that used pictures to represent objects and ideas. The Aztec script was not as sophisticated as the Maya script, but it was still capable of conveying complex information.
The Incas had a unique writing system called quipus. Quipus were made of knotted strings that were used to record numerical information. The Incas also used quipus to record historical events and other information.