No - a line graph may peak and trough depending on the data marked on the graph - a bit 'like join the dots'.
I am not aware of any name for such a line.
A straight line, a telephone line, a shipping line, a fishing line.
a line
Line segment
scratch line
A bar.
The road edge on the right side is marked by a _________ line.
If the contract is to your satisfaction, put your signature and date on the line marked by the X.
It is the melting point of pure ice and the freezing point of pure water under standard pressure.
The "neat" line.
If you are the first vehicle approaching an intersection with a red light or stop sign, stop behind the stop line if it is marked on the pavement. If there is no stop line, stop at the crosswalk, marked or not. If there is no crosswalk, stop at the edge of the sidewalk. If there is no sidewalk, stop at the edge of the intersection.
The Mason Dixon Line which has come to symbolize the cultural boundary between the Northern United States and Dixie.
1op2*11+11p2*10
Your real name is the name you have marked on your birth certificate.
The Proclamation Line,1763
A contour line marked at 50 meters indicates that every point along that line is 50 meters above or below sea level. It helps visualize the shape and elevation of the land on a topographic map.