Written:
Word Usage

Date and Time: YYYY-MM-DD
International Organization for Standardization ISO 8601 - Data elements and interchange formats -- Information interchange -- Representation of dates and times
- See: Intl. Standard | International Date Format Campaign

Telephone Number:  National (703) 234 5678; International +1 703 234 5678 
   See: Telephone Number Format

Measurement abbreviations (gal, ft, mpg, ...)
Number prefixes [kilo, mega, ...]/measurement