This set is often referred to as a 'system of equations'.

This is often referred to as an 'asynchronous' system.

This type of collection system design is now referred to as an open system.

Since a system with four states (described above) exists, it is referred to as an elementary system.

The Liberal party persists in referring to proportional representation as a fairer system.

The Zamindari System is often referred to as a feudal-like system.

The concept has more recently been referred to as an accelerator-driven system (ADS).

This is referred to as an electro-hydraulic system.

This is sometimes referred to as a bio-gac system.

Canada's electoral system is referred to as a "first past the post" system.