also: dime package · quarter package
Six defensive backs. The package past nickel, used when the defense has decided the offense is throwing and has stopped pretending otherwise.
A sixth defensive back comes on, normally for a second linebacker. The name continues the coin joke: nickel is five backs, dime is two nickels and therefore six.
Beyond dime some programs use quarter, meaning seven defensive backs, which is a professional and college situation more than a high school one. The tradeoff is stated by the personnel itself: a defense in dime has traded its ability to defend a run for its ability to cover, and a good offense's answer is usually to run at it.
dime packagenickel, quarter packageRare below high school, and rare in high school programs without the roster to field six defensive backs who can actually cover. Where it appears at youth level it is usually a goal-line-of-the-air situation rather than a real package.