It depends entirely on how you are encountering this person (long-distance or in-person), whether you share languages or have some degree of mutual intelligibility, and whether you have a simple or complex idea to communicate.
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inter office memo
Because it tells people how your feeling, but without words. Its just another way to communicate.
they communicate by sticks
it simply means---the way in which groups and co-workers communicate or interact with one another without the use of letters etc
All animals communicate. Llamas are no different - they communicate by a combination of noises, body language, and scents.