Strings (tennis)
In tennis, the strings are the part of a tennis racquet which make contact with the ball. The strings form a woven network inside the head (or "hoop") of the racquet. Strings have been made with a variety of materials and possess varying properties that have been measured, such as dynamic stiffness, tension retention, thickness (gauge), string texture (shape of the string), and rebound efficiency.
String (music)
Nylon string, traditionally used for classical music, has a more mellow tone and the responsiveness of it can be enjoyed typically for folk but other styles of music use it as well (Willie Nelson performs on a nylon string guitar). Note that nylon strings don't work with magnetic pickups, which require ferrous strings that can interact with the magnetic field of the pickups to produce a signal. Nylon strings are made of a softer, less dense material and are under less tension than steel strings (about 50% less). This means they can be used on older guitars that can't support the tension of modern steel strings.