Ruby Percent Literals

%w = String array
%i = symbol array
%r = regex

%q = non interpolated string (no string interpolation, only \\ and \' escaping allowed)
%Q = INTERPOLATED STRING (#{...} AND STUFF LIKE \n is allowed )
%Q can also be written with just %

In theory you could replace the braces with any symbol, but the way to go is as followed:

arrays = %w[hello world]
regex = %r{hello}
strings_and_others = %(world)