Some countries use the overdot as a decimal mark.

The overdot on the m is Newton's notation for a time derivative.

Each overdot is a shorthand for a time derivative.

The overdot is also used in the Devanagari script, where it is called anusvara.

Overdot is normally found in Lithuanian, underdot in Slovenian.

(One overdot indicates one time derivative).

For time derivatives, specific, molar, and flux densities of quantities there is no one symbol, nomenclature depends on subject, though time derivatives can be generally written using overdot notation.

The name is also spelled "Taḋg" in the Irish uncial alphabet with an overdot over the d to indicate it is lenited; the "dh" serves a similar purpose in the modern spelling.

A solution is to adopt the overdot notation, in which the scope of a geometric derivative with an overdot is the multivector-valued function sharing the same overdot.