W1 in 60 rule
W1% rule (Internet culture)
W68–95–99.7 rule
WDiagonal method
WFive-second rule
WHaitz's law
WHaldane's rule
WHuang's law
WLead room
WLipinski's rule of five
WLooney 11 rule
WMoore's law
WNaismith's rule
WOctet rule
WOkun's law
WPareto principle
WPie rule
WRight-hand rule
WRule of thirds
WRule of twelfths
WHistogram
WSunny 16 rule
WSwanson's law
WTwo-second rule