The boundary line or the area immediately inside the boundary

A line enclosing a plane areas

The size of something as given by the distance around it

Dead Hand, also known as Perimeter, is a Cold War-era automatic nuclear weapons-control system that was constructed by the Soviet Union.

In topology and mathematics in general, the boundary of a subset S of a topological space X is the set of points in the closure of S not belonging to the interior of S. An element of the boundary of S is called a boundary point of S. The term boundary operation refers to finding or taking the boundary of a set.

Interstate 285 is an auxiliary Interstate Highway encircling Atlanta, Georgia, for 63.98 miles.

Perimeter is a real-time strategy video game developed by Russian studio K-D Lab for Microsoft Windows.

Michael A. Rothman is an American engineer and writer of science fiction, epic fantasy, and techno thriller novels.

Russian band