Zip-fastener is a commonly used term for a device used for fastening clothing or bags. However, there are several other synonyms that can be used in place of this term, such as zipper, slide fastener, fly, zip, or chain. Zipper is probably the most commonly used synonym for a zip-fastener. A slide fastener is another synonym that is commonly used in the United States. The term "fly" is also used for the front closure of pants used in North America. In the UK, the term zip is commonly used for zip-fastener, while in other countries, such as Germany, the term chain is also used.