3Rs principle

Applicability principle

’identity’ principle

’user pays’ principle

“equal time” principle [election broadcasting]

20%~80% Principle

3B principle

3E principle

3R principle

3s principle

3σ principle

4R principle

4R Principle of Green Consumption

5R principle

6 dB principle

A new design principle for variable-pole winding

a principle of drawing up

Ab initio principle

Abbe comparator principle

Abbe double-diffraction principle