Gibor closes the Armanen row, and like Eh it has no counterpart in the Younger Futhark. It is the second of the two characters Guido von List supplied to bring his row to eighteen.
Where the name comes from
The name echoes the Elder Futhark character conventionally read as gebo, the gift. The Elder Futhark is the older twenty-four character row of the earliest Germanic inscriptions; it had been out of use in Scandinavia for centuries by the time the Younger Futhark that supplied von List's other sixteen characters was in service.
Why it is last
Von List built the row to eighteen because the Havamal lists eighteen rune-charms, and he treated the last of his eighteen as the culminating one, glossing it in terms of the giver and the gift. The position and the reading are his. The Havamal's eighteenth charm is not about an alphabet and does not describe a character.
What this rune shows about the row
Gibor is the clearest single demonstration that the Armanen row is composed rather than inherited. Its shape, its position and its meaning all originate in 1908, and its name is borrowed from a row that had fallen out of use long before the one the rest of the sequence comes from.
Reception
The Armanen row was taken up in volkisch circles and, in the 1930s and 1940s, by National Socialist organisations. The atlas records that history rather than omitting it.