TJALLING CHARLES KOOPMANSTjalling Charles Koopmans · English · Reference checkedReferenceOpen English WordNet 2024oewn2024:lemma:TJALLING CHARLES KOOPMANSTier 1Ordinal255Pythagorean93Classical240Reverse366Reverse Reduction132Standard1093Final Large1093Ordinal220Reduced76Atbash644Isopsephy1901Ordinal272Abjad1029