The sheet music is marked with dotted bar lines.

The composer marked the end of the section with a double bar line.

The politicians were divided along party lines.

Line integrals are used to calculate the total work done along a curve.

The line integral is an important concept in calculus.

Drawing a line in the sand, the CEO made it clear that any further delays would not be tolerated.

The water lines in the city were damaged during the storm.

The bottom lines of the report clearly outline the key findings.

She loves wearing A-lines.

Command line interfaces are widely used in software development.