note 1 ] (   / ˈ s iː k ɨ z əm / or / ˈ s ɪ k ɨ z əm / ; Punjabi : ਸਿੱਖੀ , sikkhī , IPA:  [ˈsɪkːʰiː] ) is a monotheistic religion founded during the 15th century in the Punjab region , by Guru Nanak