I found here the following syntax: <%=h @person.first_name %> What does the h means
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It’s for escaping the output of the tag to avoid cross-site-scripting. In rails 3, it’s been changed to the default for a string (so rather than saying escape this string, you say, this is a safe string).
http://api.rubyonrails.org/classes/ERB/Util.html#method-c-h