reckoning / account / judgment
Masculine verbal noun (maṣdar). Related: حَسِبَ (to reckon/think), حَاسَبَ (to hold to account), مُحَاسَبَةٌ (accountability). يَوْمُ الْحِسَابِ = Day of Reckoning.
The concept of ḥisāb teaches that every deed is recorded and will be accounted for. This encourages self-accountability (muḥāsabah) in daily life.