Aeonians

"What is it?" "It's Aeonian script. Translated, it means "Low Temperature Suspension Chamber"."

- Daisy Johnson and Jemma Simmons

Aeonians are a race of aliens that build Cryo-Freeze Chambers.

History
During the Search for Leo Fitz, Jemma Simmons and Daisy Johnson found the Cryo-Freeze Chamber that Leo Fitz used to travel to the future. While looking for clues inside the chamber, Simmons noticed Aeonian writing, which indicated that Aeonians had built the device and then sent it to Naro-Atzia.