Tuplet numbers/ratios
Tuplet numbers and ratios are very similar: both indicate the number of equal notes included in the tuplet, such as 3 for triplets, but tuplet ratios also include the number of normal notes into whose duration the tuplet fits, such as 3:2 for triplets.
Additionally, tuplet ratios can include a note that indicates the duration of notes in the tuplet.
Figure: A triplet with a ratio and note value indication
Tuplet numbers/ratios help performers quickly identify the type of tuplet and how they must fit the number of notes indicated into the prevailing tempo and meter.
In Dorico, you can change the appearance of all tuplet numbers/ratios project-wide on the Tuplets page in , and for individual tuplets independently of this setting.