A component can be a header, footer, etc. Additionally, a table may include metadata, annotations, a header, a footer or other ancillary features. The bullet is often used for separating menu items, usually in the footer menu. An IP packet has no data checksum or any other footer after the data section. The file format also appends an MD5 hash of the entire drive as a footer. It is instead attached at the end of the file like a footer. Version 2 added the extension area and footer. There are numerous variations in completing the Four Thousand Footer list. They support titles, subtitles, a footer, and a legend to explain the chart. They both halve the 4th hole when Marcela misses a 10 footer for the win. NMOS footer switches can also be used as sleep transistors. This equals about 3' for a 10 footer. This was later stretched to a 42 footer in 2000. A typical IOR 40 footer (a "one tonner") rated 30.55 feet. The mat is also known as the footer.