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Setun – Wikipedia, the free encyclopedia
Setun (Russian: Сетунь) was a balanced ternary computer developed in 1958 in Russia. It was one of the first practical ternary computers, using three-valued ternary logic instead of two-valued binary logic prevalent in computers before and after Setun’s conception.

It was developed at Moscow University. The computer was manufactured by the Kazan Mathematical plant. 50 computers were built.

Ternary logic – Wikipedia, the free encyclopedia
Some ternary logic systems represent truth values numerically. One common scheme uses 0 for unknown, 1 for true, and 2 for false. Other systems may represent truth with 1 and falsity with 0, denoting the third value by # or ½. Balanced ternary, often used in ternary digital circutry, uses -1 for false, 1 for true and 0 for the indeterminate value. Such a scheme may also use the shorthand -, 0, and .

Technology in Australia 1788-1988, Chapter 8, page 593
The first was the idea of the ‘recursive stack’ which developed from the proposal for a machine made by C. L. Hamblin (Hamblin, C. L., 1957a, 1957b) on the basis of the Reverse Polish notation of Lukasiewicz (1920) and first implemented on the UTECOM as the GEORGE programming system (Hamblin, C. L., 1960).