「 The Setun, the world’s first ternary computer, was developed at Moscow State University in 1958. Its troubled and short-lived history is covered in the video. The machine itself uses “trits” (ternary digits) instead of “bits” (binary digits) 」
https://hackaday.com/2026/01/03/the-setun-was-a-ternary-computer-from-the-ussr-in-1958/