Numbered musical notation and so on. Dashes after a note lengthen it, each dash by the length of a quarter note. A dot after the plain or underlined note works increases its length by half, and two dots by three quarters. The underline, along with its joining, are analogous to the number of flags and beaming in standard notation. So are dotted notes. But the analogue stops at notes worth three quarter notes and beyond, where dashes are used instead. The number "0" represents the musical rest. The rules for length is similar to that of the note, except that it is customary
Mensural notation placed after a potentially ternary note (e.g., a breve in tempus perfectum), it typically had the effect of keeping it perfect, i.e., overriding an imperfection that would otherwise have applied to it. In these cases it was also called "punctus perfectionis". Besides this, a dot could also be used in the same way as today: when it was placed after a note that was nominally binary (e.g., a breve in tempus imperfectum), it augmented it by one half "(punctus augmentationis)". In some situations, imperfection could be induced not by a note of the next smaller order but by an even