Znamenny Chant is unison, melismatic liturgical singing that has its own specific notation, called the stolp notation. The symbols used in the stolp notation are called kryuki (Russian: крюки, ‘hooks’) or znamena (Russian: знамёна, ‘signs’). Often the names of the signs are used to refer to the stolp notation. Znamenny melodies are part of a system, consisting of Eight Tones (intonation structures; called glasy); the melodies are characterized by fluency and well-balancedness.(Kholopov 2003, 192) There exist several types of Znamenny Chant: the so-called Stolpovoy, Malyj (Little) and Bolshoy (Great) Znamenny Chant. Ruthenian Chant (Prostopinije) is sometimes considered a sub-division of the Znamenny Chant tradition, with the Muscovite Chant (Znamenny Chant proper) being the second branch of the same musical continuum.