binary system
Technical term used in mathematics, computing, and related fields to refer to a system based on two elements or states.
Computers operate on a binary system.
This encryption uses a binary system.
二進法 specifically refers to the binary numeral system (base-2), while 二成文系 is a broader term for any binary system.
Compound of 二 (two), 成 (become, form), 文 (sentence, pattern), and 系 (system). The exact derivation is uncertain; it is a technical term for a binary system.