What does Rule of four mean?

Rule of four meaning in Body Language Dictionary

States that to have an exact reading of people’s body language you will need to get a hold of at the very least four congruent indicators at the same time.

Sentence Examples with the word Rule of four

The British infantry brigade consists as a rule of four battalions (or about 4000 bayonets) with supply, transport and medical units attached; the cavalry brigade of two or three regiments of cavalry.

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