Line perpendicular to a plane

This object is a flagpole. It is a pole that sticks strait up out of the ground, and is used to hang a flag as a symbol of a country. Flagpoles are also used to send distress signals, such as hanging a US flag upside-down. This object represents a line perpendicular to a plane because the pole itself sticks right up,our of the ground at a right angle, so the pole is perpendicular to the ground. This photo was also 

found on google images, in the URL http://www.gettysburgflag.com/index-Poles.php.