RULE OF THUMBrule of thumb · English · Reference checkedReferenceOpen English WordNet 2024oewn2024:lemma:RULE OF THUMBTier 1Ordinal141Pythagorean51Classical134Reverse156Reverse Reduction57Standard770Final Large1490Ordinal104Reduced41Atbash580Isopsephy1556Ordinal143Abjad871