There is no such thing as "Indian language". The country of India has over 122 officially recognised languages, many of which have nothing to do with one another. But many of them use the same script, as we Europeans do.
That list of languages you posted above are all part of the Indo-Aryan body of languages. They are written using a type of script know as the Brahmic family of scripts, which across Indo-Aryan variants are often characterised by the heavy line which runs along the top of the script.
The list you posted offers the language name in English followed by the name in Devanagari and sometimes followed by the name in the native script. Note the last entry Shina - it's written in English, Devenangari and the Shina script.
The strong top stroke of the You are not allowed to view links.
Register or
Login to view.language has nothing to do with the Voynichese gallows. Devanagari (Wikipedia notes it is the script for more than 120 languages, in the same way that the Roman alphabet is the language for dozens of European languages) uses the top stroke to denote consonant clusters.
It could be postulated that Voynichese gallows coverage has a similar function, but it is not extensively used enough in Voynichese for this to be affirmed as a rule.
@PeteB - You are not allowed to view links.
Register or
Login to view. explaining how to insert images from the manuscript into your posts from the text editor.