Tablature

Tablature (or tabulature, or tab for short) is a form of musical notation indicating instrument fingering rather than musical pitches.

Example of numeric vihuela tablature from the book "Orphenica Lyra" by Miguel de Fuenllana (1554). Red numerals (original) mark the vocal part.

Tablature is common for fretted stringed instruments such as the lute, vihuela, or guitar, as well as many free reed aerophones such as the harmonica. Tablature was common during the Renaissance and Baroque eras, and is commonly used today in notating many forms of music.

Three types of organ tablature were used in Europe: German, Spanish and Italian.[1]

To distinguish standard musical notation from tablature, the former is usually called "staff notation" or just "notation".