A straight, horizontal mark placed over two or more members of a compound quantity, which are to be subjected to the same operation, as in the expression x2 + y2 - x + y
Viols are a family of musical instruments that are made of wood and have six strings. You play the viol with a bow while sitting down. or viola da gamba Bowed stringed instrument of the 16th-18th centuries. The viols are distinguished from the violin family particularly by a fretted fingerboard, sloping shoulders, flat back, six strings, and milder tone. They exist in four sizes: treble, tenor, bass, and double bass (violone). They are played vertically, the body of the instrument being held between the legs or rested on the knee. The viol family appeared in the late 15th century and soon became widely popular and acquired a large repertory. Throughout the Baroque era, the bass viol joined the harpsichord in the basso continuo. The contemporaneous violin family, having a more penetrating tone, gradually displaced the viols in the 18th century
A stringed musical instrument formerly in use, of the same form as the violin, but larger, and having six strings, to be struck with a bow, and the neck furnished with frets for stopping the strings