Sr

Sr
Strontium forms a protective stable oxide coating but it will burn in air and reacts with water.
sr
The steradian is the solid angle, having its vertex in the centre of a sphere, cuts off an area of the surface of the sphere equal to that of a square with sides of equal length to the radius of the sphere.
SRAM
An integrated circuit similar to a DRAM with the exception that the memory does not need to be refreshed.