1. In
technical analysis, a situation in which the
supply and
demand for a
security are largely the same. A line means that the security is unlikely to see any rapid fluctuation in
price. It is called a line because, when plotted on a graph, it looks like a roughly horizontal line. Technical analysts look for signals that a line is ready to break one way or another before recommending that
investors take a
position on a security.
2. Informal; workers in a large, industrial company. They are called the line because, historically, they assembled the parts of a product while literally standing next to each other in a long line, also called an
assembly line.