For some reason my brain has defected and has chosen a life of NEVER being able to recall basically anything related to Ruby’s % notation. After seeing this list on a recent Arkency blog post (an awesome blog) I’ve decided to steal repost it here for my own personal reference.

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%q[ ] # Non-interpolated String (except for \\ \[ and \])
%Q[ ] # Interpolated String (default)
%r[ ] # Interpolated Regexp (flags can appear after the closing delimiter)
%i[ ] # Non-interpolated Array of symbols, separated by whitespace
%I[ ] # Interpolated Array of symbols, separated by whitespace
%w[ ] # Non-interpolated Array of words, separated by whitespace
%W[ ] # Interpolated Array of words, separated by whitespace
%x[ ] # Interpolated shell command