The yard and meter are common units of length. A globe can be used to talk about the original definition of the kilometer: the line from the pole to the equator through Paris was 10,000 km.
A nsec is a nano second which is equal to 10^-9 seconds. Light can travel 30cm in 1 nano second
The x-axis, y-axis, and z-axis makeup a 3 dimension coordinate system.
A cube of wood exactly 10cm on a side has a volume equal to 1000cm^3 or exactly 1 liter.