Posture and behavior training in BDSM and Dom Sub relationships uses non-verbal ques such as hand-signs and subtle gestures. These gestures are built up over time, through step by step training and "pop quiz" random testing, that will result in reward or punishment.
Silent or non verbal communication brings a deeper connection, not only each other but the dynamic and intention created that relies upon a constant attentive experience between Dom and Sub.
Once achieved, this level of connection can be engaged with both in private and public, creating a bubble that no other can penetrate.
Below are a few hand gestures for non verbal BDSM communication.