Is BODY LANGUAGE an important skill that needs to be mastered by PMs?

Generally speaking non-verbal communication is a significant contributor when we need to pass on the message to the ppl/group we are interacting with. As a project manager I have encountered situations when you need to speak to set of ppl from diverse geography, age, language etc. and in these situations a good non-verbal communication skill and understanding of others' non-verbal clues gives an edge to you.

Well mastering may be a bit far fetched but this is an important aspect for sure. Our words take more importance and are more likely to be admissible when delivered with proper body language. We should be able convey in a confident manner at the minimum.

Non-verbal communication is equally important as verbal and written.
It brings an element of attachment in communication.
The non-verbal channel of seeing and feeling allows our brain to understand better of the emotions and directions of the communicator.