(a) trace.
The line that reflects the general pattern of a graph is called a trend line.
In typesetting, the thickness of a line is called its weight and is measured in points.
inertia
if you mean the horizontal line on a graph t is refered to as the x axis or y=0
Displacement.
oscilliscope
An Oscilliscope is used for measuring signal voltages and the wave shape in an electrical signal. One can find detailed information about them on Wikipedia.
see link below
Some bench test them with an oscilliscope.
None, exepct for a crazy hollogram imstument
A location on a line is often called a point, or a place on the line.
The croquet start line is called a baulk line.
A line of violent storms is called a squall line.
i think its called the E line
the line is called the normal
It is called a horizontal line!
The battle line in France is called the Maginot line. The German line was called the Hindbergh line. The Maginot was not able to prevent the German invasion of the 1930s