master's degree
Refers to the academic degree itself, typically a master's degree from a graduate school.
He earned a master's degree in engineering.
学士号 is a bachelor's degree, one level below 修士号.
博士号 is a doctoral degree, one level above 修士号.
Compound of 修士 (master's degree holder or master's program) and 号 (title, designation). The term follows the pattern of academic degree names ending in 号.