Units of measure
Use only units of the International System of Units (SI) to express the values of quantities.
International authority: Bureau International des Poids et Mesures (BIPM), https://www.bipm.org
Standard: BIPM SI Brochure. United States interpretation is available from the Department of Commerce at https://www.nist.gov/pml/pubs.
Usage: Quantities are always expressed with a unit symbol. Use a nonbreaking space (Option-Space bar) between the quantity and its symbol. Unit symbols are unaltered in the plural and are never hyphenated, even when they’re used as an adjective. Symbols for SI units of measure aren’t followed by a period unless they appear at the end of a sentence. Don’t imply more precision than is reasonable in choosing a unit symbol.
The Apple USB-C to 3.5 mm Audio Cable is 1.2 m long.
MacBook Neo weighs 1.23 kg.
Equivalent values in non-SI units may be given in parentheses following SI values.
iPad mini (A17 Pro) Wi-Fi models weigh 293 g (0.65 lb.).