The Rañjanā script (Lantsa[2]) is an abugida writing system which developed in the 11th century[3] and until the mid-20th century was used in an area from Nepal to Tibet by the Newar people, the historic inhabitants of the Kathmandu Valley, to write Sanskrit and Newar (Nepal Bhasa).

[citation needed] The Aṣṭasāhasrikā Prajñāpāramitā Sūtra lettered in gold ink by Bhiksu Ananda of Kapitanagar and dating back to the Nepal Sambat year 345 (1215 CE) is an early example of the script.

[7] The shape of the combining marks indicating the vowels आ ā, ए e, ऐ ai/ē,ओ o, and औ au/ō in Ranjana script take a different form when combined with the eight consonants ख kha, ग ga, n ञ nya, ठ ṭha ण ṇa, थ tha, ध dha or श sha(or where one of these is the first consonant in a combination)[8] (In addition the vertical marks indicating आ ā or ī may take a shorter form when combined with the consonants क ka, ज्ञ ja, or ठ ṭha.)

In particular the glyph shapes of some consonants and ligatures differs and vowel diacritics do not usually change with the consonants ख kha, ग ga, n ञ nya, ठ ṭha ण ṇa, ध dha श sha as described above~ with the sole exception of the letter ठ ṭha.

[19] Examples of such texts include the Mañjuśrīnāmasamgīti, the Diamond Sutra and the Aṣṭasāhasrikā Prajñāpāramitā Sūtra.

The Lantsa script is also found in manuscripts and printed editions of some Sanskrit-Tibetan lexicons such as the Mahāvyutpatti.

Numerous alternative spellings of the term Lantsa exist, including the following: Kutākshar is a monogram of the Ranjana script.

A Unicode block for the script has first been proposed in 2009 by Michael Everson[9] and updated in December 2013[20], and last revized with additional details in January 2023 by Anshuman Pandey[21].