A letter attachment is a type of document that is attached to a letter or other form of written communication. The two crossword solutions for this term are cedilla (7 letters) and STAMP (5 letters). A cedilla is a diacritical mark used in some languages, such as French, to indicate that the preceding letter should be pronounced differently. A STAMP is an adhesive paper label that is affixed to a document to indicate that a fee has been paid or that the document has been approved.