What is the meaning of ᛄ?

A letter of the Runic alphabet, present in the Elder Fuþark (ᛃ), the Anglo-Saxon Fuþorc (ᛄ, called ġēr), and the Younger Fuþark (ᛅ, called ár in Old Norse), representing /j/ in the Anglo-Saxon Fuþorc, and associated with the year or the harvest.

the twelfth letter of the Old English runic alphabet, representing /j/

Source: wiktionary.org