Elevated to Mystical Status...And Sometimes Sacrificed

Wikipedia: Twins and Society

Identical twins can cause some observers to question their own beliefs about identity and individuality, and results in twins being treated differently or regarded as special. In some earlier cultures, twins were either elevated to mystical status and worshipped (for a recent case see Johnny and Luther Htoo), and sometimes sacrificed in others. Parents frequently give twins names that rhyme or are alliterative, further blurring the distinctions between them. Twins often claim to be psychically or telepathically connected to their twin.

(Side note: MKA are fraternal twins, but are often believed to be identical due to their similarity in appearance)