However, it's important to note that:
* लेखनी (lekhini) is a more general term that can also refer to any writing instrument, including a quill or a stylus.
* If you're looking for a more specific term for a modern pen, you might use कलम (kalam), which is a loanword from Persian.
* The term पेन (pen) is also used in modern Sanskrit, as it's a direct loanword from English.
So, depending on the context, you can choose the most appropriate word.