Northeastern Iberian script in the context of "Semisyllabic"

Celtiberian or Northeastern Hispano-Celtic is an extinct Indo-European language of the Celtic branch spoken by the Celtiberians in an area of the Iberian Peninsula between the headwaters of the Douro, Tagus, Júcar and Turia rivers and the Ebro river. This language is directly attested in nearly 200 inscriptions dated from the 2nd century BC to the 1st century AD, mainly in Celtiberian script, a direct adaptation of the northeastern Iberian script, but also in the Latin alphabet. The longest extant Celtiberian inscriptions are those on three Botorrita plaques, bronze plaques from Botorrita near Zaragoza, dating to the early 1st century BC, labeled Botorrita I, III and IV (Botorrita II is in Latin). Shorter and more fragmentary is the Novallas bronze tablet.

The Celtiberian script is a Paleohispanic script that was the main writing system of the Celtiberian language, an extinct Continental Celtic language, which was also occasionally written using the Latin alphabet. This script is a direct adaptation of the northeastern Iberian script, the most frequently used of the Iberian scripts.

The Paleohispanic scripts are the ancient writing systems created in the Iberian Peninsula before the Latin alphabet became the dominant script. They derive from the Phoenician alphabet, with the exception of the Greco-Iberian alphabet, which is a direct adaptation of the Greek alphabet. Some researchers believe that the Greek alphabet may also have played a role in the origin of the other Paleohispanic scripts. Most of these scripts are notable for being semi-syllabic rather than purely alphabetic.

Paleohispanic scripts are known to have been used from the 5th century BCE—possibly as early as the 7th century, according to some researchers—until the end of the 1st century BCE or the beginning of the 1st century CE. They were the primary scripts used to write the Paleohispanic languages.

A semi-syllabary is a writing system that behaves partly as an alphabet and partly as a syllabary. The main group of semi-syllabic writing are the Paleohispanic scripts of ancient Spain, a group of semi-syllabaries that transform redundant plosive consonants of the Phoenician alphabet into syllabograms.

Out of confusion, the term is sometimes applied to a different alphabetic typology known as abugida, alphasyllabary or neosyllabary, but for the purposes of this article it will be restricted to scripts where some characters are alphabetic and others are syllabic.

The southeastern Iberian script, also known as Meridional Iberian, was one of the means of written expression for the Iberian language, which was primarily written in the northeastern Iberian script and, to a lesser extent, by the Greco-Iberian alphabet. In understanding the relationship between the northeastern and southeastern Iberian scripts, some note that they are two distinct scripts with different values assigned to the same signs. However, they share a common origin, and the most widely accepted hypothesis is that the northeastern Iberian script was derived from the southeastern Iberian script.

In fact, the southeastern Iberian script is very similar to the Southwestern script, which is used to represent an unknown language typically referred to as Tartessian, both in terms of the shape of the signs and their values. The main difference is that the southeastern Iberian script does not exhibit the vocalic redundancy found in the syllabic signs of the northeastern Iberian script.