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.
Guqin strings
There are a number of Chinese characters for the word "string(s)". 『絃』, 『弦』, 『線』 and 『綫』. According to "Chinese Characters" (1915), 『線』 and 『綫/线』 are both the same character (the former used in Taiwan and Hong Kong, the later used in mainland China in its simplified form), which meaning is 'thread', 'line' or 'wire'. However, the characters 『絃』 and 『弦』 mean the same thing ('string'), but have different etymological meanings. In the case of 『絃』, the radical is 「糸」, which is the radical for silk, whilst for 『弦』, the radical is 「弓」 which is the radical for the archery 'bow'. It is important to distinguish from the two as they are often used to refer to the strings of the qin, or any other stringed instrument, sometimes together on the same page. However, etymologically, 『絃』 is the correct character to be used to refer to strings of the qin as the radical denotes, qin strings were made of silk (though probably etymologically incorrect for the modern metal-nylon strings). But for 『弦』, it probably denotes a string used on an instrument which requires a bow to play, such as erhu or violin. Maybe, 『弦』 can also be used to refer to metal / metal-nylon strings...