Char Escaping
Stylus lets you escape characters. This effectively turns them into identifiers, allowing them to be rendered as literals.
For example:
body
  padding 1 \+ 2
body
  padding 1 \+ 2
Compiles to:
body {
  padding: 1 + 2;
}
body {
  padding: 1 + 2;
}
Note that Stylus requires that / is parenthesized when used in a property:
body
  font 14px/1.4
  font (14px/1.4)
body
  font 14px/1.4
  font (14px/1.4)
yields:
body {
  font: 14px/1.4;
  font: 10px;
}
body {
  font: 14px/1.4;
  font: 10px;
}