I think 'stepness' should be 'steepness'. Steepness of the line is called slope of the line.
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
a verse or a stanza depending on the structure and length of the line.
It is called the "ordinate" axis.
The white line on the shoulder of a highway is called the FOG line
The end of the railway line is called the terminus. It can also be called the terminal. It is the place where the line ends or terminates.
The zigzag line is called the zigzag line or is sometimes referred to as the Hays-McDaniel line