Straight lines

straight-lines

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There are a ton of straight lines commonly seen in English text.

 - `‐` - the hyphen, used to join breaks within words or compound words
 - `–` - the en-dash, used for spans of numbers or compound adjectives
 - `—` - the em-dash, used in place of colons, commas, and parentheses
 - `_` - the underscore, originally used to underline words by typewriters
 - `|` - the vertical bar of many uses.

This doesn't even include the dozens of singular lines [available in Unicode](http://unicodelookup.com/#hyphen/1).

Add note about straight lines
Add note about straight lines
