스테라디안; 입체각 단위
steradian(s). (The SI unit of solid angle, equal to the solid angle subtended at the center of a sphere by an area on the surface equal to the square of the radius.)
예문:
"The solid angle was measured in sr, indicating the extent of the light cone."
"One full sphere measures 4π sr, which is the maximum possible solid angle."
서던 철도; 영국 철도 회사
Southern Railway. (A former British railway company that operated in the south of England.)
예문:
"Many historical locomotives preserved today were originally part of the SR fleet."
"The SR operated passenger and freight services across the south of England until 1948."