The term ENV can be broken down into two crossword solutions: ENC (3 letters) and LTR (3 letters). ENC stands for 'Environmental Protection Agency' which is a federal agency of the United States government that is responsible for protecting human health and the environment. LTR stands for 'LETTER' which is a written message from one person or organization to another. In both cases, ENV is used to refer to the environment and the protection of it.