Quadrangle or Quad
   Always capitalize.

quotations
   For print applications, turn on the smart quote setting. Do not use inch marks.
   For Web applications, turn off the smart quotes setting, and use inch marks for quotation marks to ensure that
   characters will not be changed or lost when transferred to the Web.

quotes    
      • For print applications, turn on the smart quote setting. Do not use a foot mark or inch mark for these characters.

      • For Web applications, turn off the smart quotes setting, and use foot marks for apostrophes and inch marks for
        quotations to ensure that characters will not be changed or lost when transferred to the Web.

       • Quotation is a noun.

       • Quote is a verb.