The relative positions of <a href="https://en.wikipedia.org/wiki/Official_(gridiron_football)" class="extiw" title="en:Official (gridiron football)">American and Canadian football officials</a> in a eight-official system:
<ul><li>The Referee (R) positions himself behind the offensive team, favoring the right side if the quarterback is a right-handed passer.</li>
<li>The Center Judge (C) positions himself behind the offensive team, on the opposite side of the referee.</li>
<li>The Umpire (U) stands behind the defensive line and linebackers.</li>
<li>The Head Linesman (H) stands at one end of the line of scrimmage.</li>
<li>The Line Judge (L) stands at the other end of the line of scrimmage.</li>
<li>The Field Judge (F) works downfield behind the defensive secondary on the same sideline as the Line Judge.</li>
<li>The Side Judge (S) works downfield behind the defensive secondary on the same sideline as the Head Linesman.</li>
<li>The Back Judge (B) stands behind the defensive secondary in the middle of the field.</li></ul>
Derivative work by <a href="//commons.wikimedia.org/wiki/User:Zzyzx11" title="User:Zzyzx11">Zzyzx11</a> (<a href="//commons.wikimedia.org/wiki/User_talk:Zzyzx11" title="User talk:Zzyzx11">talk</a>)
CC BY-SA 4.0
<p>Derived from <a href="//commons.wikimedia.org/wiki/File:American_football_officials_positions.svg" title="File:American football officials positions.svg">File:American football officials positions.svg</a>, which was derived from <a href="//commons.wikimedia.org/wiki/File:American_football_positions.svg" title="File:American football positions.svg">File:American football positions.svg</a>
</p>
<ul><li>Original source files:
<ul><li><a href="//commons.wikimedia.org/wiki/File:American_football_officials_positions.svg" title="File:American football officials positions.svg">File:American football officials positions.svg</a>: <a href="//commons.wikimedia.org/wiki/User:Zzyzx11" title="User:Zzyzx11">Zzyzx11</a>, version uploaded 16:17, 21 June 2009 (UTC)<a class="external autonumber" href="https://commons.wikimedia.org/w/index.php?oldid=22589109">[1]</a></li>
<li><a href="//commons.wikimedia.org/wiki/File:American_football_positions.svg" title="File:American football positions.svg">File:American football positions.svg</a>: <a href="//commons.wikimedia.org/wiki/User:UserB" class="mw-redirect" title="User:UserB">UserB</a>, version uploaded 14:47, 1 July 2007 (UTC)<a class="external autonumber" href="https://commons.wikimedia.org/w/index.php?oldid=25411243">[2]</a></li></ul></li></ul>