It sounds like you might be referring to the Hindi word (which means "of" or "'s" in English), or perhaps a specific extension with a name starting with "Ka".
However, if you're asking about a specific extension related to Photoshop, here are a few examples: photoshop ka extension name
It is the only extension that Adobe was actually scared of. It was so good that Google bought it just to kill the competition, and then gave it away for free. It includes tools like Color Efex Pro and Silver Efex Pro . It sounds like you might be referring to