3-LEGGED STOOL
The 3 legged stool is an old phrase used to identify balance and stability. It has been used in the financial planning, HR world, leadership, science and psychology world. When you look at the metaphor in the different contexts, you identify that the 3 legged stool is a great metaphor to describe stability, optimal functionality and strength.
Without one, the three-legged stool would not function.