Slashed and crossed digits anywhere …?

Andreas Stötzner

I eventually came across digits (figures) which have a crossing slash, or even two or three, or a saltire on them. In Math and accounting literature they were used frequently and I would like to learn, if such notation is (or was) known in other fields.

Examples below: Type specimen book (Frankfurt 1834); Tartaglia: General Trattato de numeri… (16th c.); manuscript by G. W. Leibniz (17th c.).

John Butler

It looks like they are used to describe the process of arithmetic.

Andreas Stötzner

John Butler said:

It looks like they are used to describe the process of arithmetic.

true.

Denis Moyogo Jacquerye

Weren’t they also used in musical notation at some point?