Upekkhā is the fourth divine abode and the seventh factor of awakening. It is not indifference but a balance in which the mind can meet pleasure and pain, friend and enemy, without being pulled. In the higher absorptions and in insight, equanimity toward all formations is a mark of maturity.
Upekkhā
Equanimity: balanced, even-minded regard for all that arises, neither attracted nor repelled.
Also: Upeksha, equanimity