This language was spoken primarily by giants of the dnd languages. The oldest language spoken by giants is 5e, a giant language. By those who speak it, they call it Jotun. It was one of the oldest and best-known languages. It believed the language was linked to some of its roots by the common and thorass.
The script for the d&d language of the giants uses its own script. Both the ancient giants and the modern giants used dethek ranes for writing. The logographic ranes were also used by the ancient giants for runecasting. They were also used to symbolically refer to the giant subraces or gods.
They were not an alphabet or a system of syllabaries, but rather diagrams or models to help understand the relationship between cosmic forces or deeper truths.