“Percent” is spelled out.
Exception: "%" is used in tabular matter and confined spaces.
If there are mathematical symbols in the manuscript, include a note for the typesetter at the very top of the file (“[TYPE: math]”). A separate macro will be run to convert codes into mathematical symbols.
Math codes are as follows:
In measures of angles and temperature, when the unit of measurement is implicit, the symbol for degree (°) is not separated from the numeral.
a 45° angle
it was 30° today
In measures of temperature, when the unit of measurement is explicit, the symbol for degree (°) is separated from the numeral by a space and is followed immediately by the abbreviated unit of measure.
it was 30 °C today
bake at 300 °F
Symbols for feet and inches and for degrees and minutes (′ and ″) are represented in manuscript by single and double quotation marks, and are not separated from the numeral. The copy editor must mark these symbols as characters to be distinguished from regular single and double quotation marks.
a 2″ x 4″ board
at 73′ 17″ on the map