pisüsteem
Pisüsteem is an Estonian term used to describe a small or compact system. It is not a formal, universally defined technical term; rather, it functions as a general descriptor whose exact meaning depends on context. In practice it can refer to a subsystem, a compact version of a larger system, or a self-contained unit designed to perform a limited set of functions.
The word is formed from pisi meaning small and süsteem meaning system, combined to express the idea
In technology and engineering, pisüsteem often points to embedded systems or small controllers built around microprocessors.
Because it is not a standardized term, its use is informal and varies by field and author.