United States dollar or ""bill"" (e.g. ""two bills"" being $200). The $50 note is occasionally called a ""yardstick"" or a ""grant"" (after President Ulysses S. Grant, pictured on the obverse). The $20 note is referred to as a ""double sawbuck"", ""Jackson"" (after Andrew Jackson), or "double eagle". The $10 note is referred to as a ""sawbuck"", ""ten-spot"" or ""Hamilton"" (after Alexander Hamilton). The $5 note as ""Lincoln"", ""fin"", ""fiver"" or ""five-spot"". The infrequently-used $2 note is sometimes called ""deuce"", ""Tom"", or ""Jefferson"" (after Thomas Jefferson). The $1 note as a ""single"" or ""buck"". The dollar has also been referred to as a ""bone""
The purpose of a system is what it does The purpose of a system is what it does The purpose of a system is what it does (POSIWID) is a systems thinking heuristic coined by Stafford Beer. Stafford Beer coined the term POSIWID and used it many times in public addresses. In his address to the University of Valladolid, Spain, in October 2001, he said "According to the cybernetician, the purpose of a system is what it does. This is a basic dictum. It stands for bald fact, which makes a better starting point in seeking understanding than the familiar attributions of good intention, prejudices about expectations, moral judgment,