finite field
Technical term in abstract algebra; a field with a finite number of elements. Also called a Galois field.
Elliptic curves over finite fields are important in cryptography.
A finite field whose order is a prime number has a simple structure.
有限群 is a finite group, a related algebraic structure, but 有限体 is a field with two operations.
Compound of 有限 (finite) and 体 (field, in the algebraic sense). The term 体 for 'field' was coined in Japanese mathematics during the Meiji era as a translation of the German 'Körper'.