1
three cardinal virtues (wisdom, benevolence and valour (valor))
2
(having) three uses (e.g. a kitchen knife);(having) three advantages (e.g. a method)
See also:
三徳包丁 (さんとくほうちょう)
3
three qualities of nirvana (dharmakaya, prajna and moksha);three qualities of parinirvana
4
three virtues of Buddhahood (benevolence, wisdom and renunciation of klesha);three virtues of Buddhistic enlightenment
5
small pouch with separate pockets for a handkerchief, notes and toothpicks (popular during the Edo period)
1
Santoku