noun
biquinary
Technical computing term for a numeral system that uses a combination of two and five to represent decimal digits, such as in abacuses or early computers.
そろばんの玉の配置は２進５進の考え方に基づいている。
The bead arrangement of the abacus is based on the biquinary concept.
初期のコンピューターには２進５進コードが使われた。
Biquinary code was used in early computers.
五進法 is the quinary numeral system (base 5), whereas ２進５進 uses both binary and quinary elements to represent decimal digits.
Compound of ２進 (binary) and ５進 (quinary), directly describing the mixed-radix nature of the biquinary system.