Isthmian script

This article has multiple issues. Please help improve it or discuss these issues on the talk page. (Learn how and when to remove these messages) This article needs attention from an expert in Indigenous peoples of the Americas. The specific problem is: It does not seem appropriate to characterize it as a full writing system, when the decipherment and interpretation is disputed.. WikiProject Indigenous peoples of the Americas may be able to help recruit an expert. (February 2024) This article's factual accuracy is disputed. Relevant discussion may be found on the talk page. Please help to ensure that disputed statements are reliably sourced. (February 2024) (Learn how and when to remove this message) (Learn how and when to remove this message)

Isthmian script
Detail showing three columns of glyphs from La Mojarra Stela 1. The two right columns are Isthmian glyphs. The left column gives a Mesoamerican Long Count calendar date of 8.5.16.9.7, or 156 CE.
Script type	Undeciphered (assumed to be logosyllabic)
Time period	c. 500 BCE – 500 CE
Direction	Top-to-bottom
Languages	Epi-Olmec (ISO639-3:xep)

The Isthmian script is an early set of symbols found in inscriptions around the Isthmus of Tehuantepec, dating to c. 500 BCE – 500 CE, though with dates subject to disagreement. It is also called the La Mojarra script and the Epi-Olmec script ('post-Olmec script').

It has not been conclusively determined whether Isthmian script is a true writing system that represents a spoken language, or is a system of proto-writing. According to a disputed partial decipherment, it is structurally similar to the Maya script, and like Maya uses one set of characters to represent morphemes, and a second set to represent syllables.