What does %i or %I do in Ruby?

%i[ ] # Non-interpolated Array of symbols, separated by whitespace
%I[ ] # Interpolated Array of symbols, separated by whitespace

The second link from my search results http://ruby.zigzo.com/2014/08/21/rubys-notation/

Examples in IRB:

%i[ test ]
# => [:test]
str = "other"
%I[ test_#{str} ]
# => [:test_other]