What is the abbreviation for lines?

There isn't a single, universally accepted abbreviation for "lines." The most common abbreviation depends on the context:

In writing:

* ln. This is the most common abbreviation for "lines" in manuscripts and documents.

In other contexts:

* lns. This is another common abbreviation, especially if it is used with a number, like "10 lns."

* line(s). This is a clear abbreviation that can be used in any context.

* l. This abbreviation is used in technical contexts, such as in geometry or engineering.

The best abbreviation to use depends on the specific situation and your audience. It's always good to be clear and avoid ambiguity.