rune

noun

1. A letter, or character, belonging to the written language of various ancient Germanic peoples, especially the Scandinavians and the Anglo-Saxons.

2. A Finnish or Scandinavian epic poem, or a division of one, especially a division of the Kalevala.

3. A letter or mark used as mystical or magic symbol.

4. A verse or song, especially one with mystical or mysterious overtones; a spell or an incantation.

5. A roun (secret or mystery).

6. In the Go programming language, a Unicode code point.