The Hyphen. The hyphen is the shortest of the three marks, and we use it most commonly to combine words (making compounds such as "well-being" and "advanced-level," for example) and to separate numbers that are not inclusive (in phone numbers and Social Security numbers, for example).. On computer keyboards, the hyphen appears on the bottom half of the key located on the top row ...
Dashes between Numbers Dashes are used between numbers: (1) To show ranges. 0800-0900 hrs ; 2014-2020 ; 10-15 minutes ; 100-120 staff ; These are en dashes (the same length as a lowercase "n"). They are shorter than em dashes (the same length as uppercase "M"). Read more about dashes with date ranges. Read more about dashes in numbers.