Chest pain is an umbrella term to describe any pain or discomfort in the chest area (image of chest area). It may feel dull or sharp, last a few seconds to a few hours, occur in one spot or spread across the width of the body and down the arms.
file name - (computer science) the name given to a computer file in order to distinguish it from other files; may contain an extension that indicates the type of file. computer file name, computer filename, filename.
Filename extension. A filename extension is an identifier specified as a suffix to the name of a computer file. The extension indicates a characteristic of the file contents or its intended use. A file extension is typically delimited from the filename with a full stop (period), but in some systems it is separated with spaces. Some file systems implement filename extensions as a feature of the file system itself and may limit the length and format of the extension, while others treat filename extensions as part of the filename without special distinction.