Idu script

Idu (이두, hanja : 吏讀, meaning official's reading) is an archaic writing system that represents the Korean language using hanja. The term "idu" is used in two senses. It may refer to various systems of representing Korean phonology through Chinese characters called hanja, which were used from the early Three Kingdoms to Joseon periods. In this sense it includes hyangchal and gugyeol writing, as well as the narrower sense of "idu". The narrower sense refers solely to the system developed in the Goryeo period (918–1392), and first referred to by name in the Jewang Ungi.

The idu script used hanja, along with special symbols to indicate Korean verb endings and other grammatical markers that were different in Korean from Chinese. This made both the meaning and pronunciation difficult to parse, and was one reason the system was gradually abandoned, to be replaced with hangul, after the invention of such in the 15th century. In this respect, it faced problems analogous to those that confronted early efforts to represent the Japanese language with kanji, due to grammatical differences between these languages and Chinese. In Japan the early use of Chinese characters for Japanese grammar was in man'yōgana, which was replaced by kana, the Japanese syllabic script.