Which Sikh Guru introduced the Gurmukhi script?

Which Sikh Guru introduced the Gurmukhi script? Guru Angad introduced and standardized Gurmukhi.

Guru Angad, born Lehna, became the second Sikh Guru after Guru Nanak selected him as successor in 1539. Sikh tradition credits Angad with shaping Gurmukhi from earlier regional scripts and making it practical for recording and teaching Sikh religious poetry in the language of the people.

Gurmukhi became especially important because the Sikh scriptural tradition was preserved in it. The Adi Granth, compiled later by Guru Arjan, was written primarily in Gurmukhi, although it contains compositions in several languages and dialects. Gurmukhi is now the standard script for Punjabi in Indian Punjab; Punjabi in Pakistan is generally written in Shahmukhi, a Perso-Arabic script.

The wording “introduced” is a useful quiz shorthand, but historians distinguish creation from standardization. Earlier forms and related scripts existed before Sikhism. Thus, Angad is conventionally credited not with inventing every letter from nothing, but with standardizing and promoting the script that became central to Sikh literature.