* Misremembered: You may be recalling a different phrase or concept that shares some similarities with "comparative silhouetting."
* A specific term within a niche field: There could be a very specialized field where this term is used.
* A new concept: It's possible that someone coined this term recently, and it hasn't gained widespread usage yet.
To help me understand what you mean, could you provide more context? For example:
* Where did you hear this term?
* What was the context of the discussion?
* What were the main points being discussed?
With more information, I can better understand your query and offer a more accurate response.