With the aid of a Tee square any type of straight line can be produced.
It is a straight line equation.
The straight line with no slope is a point
vertical
straight line
Horizontal
180 degrees
A multivibrator produces square or rectangular waveforms.
180 degrees -- a straight angle
Translation.
down hill dog
Straight line method
Although other high powered straight line muscle type cars were already being produced the 64 Pontiac GTO gets the official nod.