* Person: Someone named Silent Lotus.
* Book/Movie/Song/Brand: A specific work or product with that title.
* Place: A location with that name, like a restaurant or a garden.
However, if "Silent Lotus" is simply a descriptive phrase used to describe something, then it is not a proper noun. For example:
* A quiet, peaceful lotus flower - Here, "Silent Lotus" is just a way to describe the flower.
To know for sure, you need more context.
Can you tell me how you encountered the phrase "Silent Lotus"? That will help me determine if it's a proper noun or not.