School colors
In the United States, school colors are the colors chosen by a school to represent it on uniforms and other items of identification. Most schools have two colors, which are usually chosen to avoid conflicts with other schools with which the school competes in sports and other activities. The colors are often worn to build morale among the teachers and pupils, and as an expression of school spirit.
School colors are often found in pairs and rarely no more than trios, though some professional teams use up to four colors in a set. The choice of colors usually follows the rule of tincture from heraldry, but exceptions to this rule are known.
Common primary colors include orange, purple, blue, red, and green. These colors are either paired with a color representing a metal (often black, brown, gray (or silver), white, or gold), or occasionally each other, such as orange/blue, red/green, or blue/yellow. Pairing two metals, such as black/white, silver/gold, and especially black/gold, is also a common practice. Finally, some American schools, in a display of patriotism, adopt the national colors of red/white/blue.