What is the meaning of ᛋ?

A letter of the Runic alphabet, present in the Elder Fuþark (as ᛊ), the Anglo-Saxon Fuþorc (ᛋ, called Siġel), and the Younger Fuþark (ᛋ), representing /s/ and associated in all three with the sun.

the sixteenth letter of the Old English runic alphabet, representing ⟨s⟩ and the sounds /s, z/. Pronounced siġel (“sun”)

Source: wiktionary.org