The answer to the crossword puzzle for the term 'SMALLEST PART OF THIS?' is DOT (3 letters). The term 'DOT' is used to refer to a small, round mark that is used in writing and printing. It is often used to indicate a pause or to separate parts of a sentence. In mathematics, a DOT is used to represent a decimal point or a multiplication sign. In computing, a DOT is used to separate parts of a domain name.