Salesforce Style Guide for Documentation and User Interface Text
jSpacing
- Insert a space between a number and any multiple-letter abbreviation or unit symbol it modifies: 120 MB
- Omit a space between a number and a single-letter abbreviation or unit symbol: 90%, 401(k)
- When a measurement is used as an adjective, use a hyphen to connect the number to the measurement, as in 10-point type. Otherwise, don't use a hyphen.
- Avoid using Nonbreaking Spaces.