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space and dot 1 234 567.89
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nothing and dot 1234567.89
nothing and comma 1234567,89
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*SI (International System of Units):

A modern, coherent system of measurement units, built around seven base units. The SI is officially adopted by almost every country in the world.

*US customary system:

The common measurement system of the United States. This system has derived from the imperial system, but has several significant differences.

*Imperial system:

A British measurement system, first standardized in 1824, based on the standard units yard, pound and gallon.