確認
かくにん · kakunin · JLPT N3 · noun
avowal
📋 確認 = certain + recognize: you check it until you know it's true
確 means firm or certain, as in 確実 (certain). 認 means recognize or acknowledge, as in 認める (to admit). So you check something until you can say it is certain. Kakunin is the word on every double-check prompt.