• Ternary complex, a complex formed by the interaction of three molecules
• Ternary compound, a type of chemical compound
• Ternary computer, a computer using a ternary numeral system
• Ternary form, a form used for structuring music
• Ternary logic, a logic system with the values true, false, and some other value
• Ternary numeral system, a base-3 counting system
• Balanced ternary, a positional numeral system, useful for comparison logic
• Ternary operation, an operation that takes three parameters
• Ternary plot or ternary graph, a plot that shows the ratios of three proportions
• Ternary search, a computer science technique for finding the minimum or maximum of a function
• Ternary signal, a signal that can assume three significant values

See also

• Binary (2)
• Tertiary (3rd)
• Quaternary (4)
• Quinary (5)
• Senary (6)
• Septenary (7)