Abracadabra is a magic word, historically used as an apotropaic incantation on amulets and common today in stage magic. It is of unknown origin.
A silver talisman from the 6th or 7th century, inscribed with words similar to abracadabra
Abracadabra written in a triangular form as represented in Encyclopædia Britannica
An incantation, a spell, a charm, an enchantment, or a bewitchery, is a magical formula intended to trigger a magical effect on a person or objects. The formula can be spoken, sung, or chanted. An incantation can also be performed during ceremonial rituals or prayers. In the world of magic, wizards, witches, and fairies are common performers of incantations in culture and folklore.
The Enchanted Garden of Messer Ansaldo by Marie Spartali Stillman
Classic magic words
The enchantress Alcina makes herself appear beautiful, in Orlando Furioso
A complete history of magik, sorcery, and wi Wellcome L0026620