STOPbody????

Saw this in a css file.... the section relates to gradients:
STOPbody {
background: #383838; /* Old browsers */
background: -moz-linear-gradient(top, #383838 0%, #1c1c1c 9%, #2b2b2b 24%, #111111 40%, #474747 61%, #666666 75%, #595959 88%, #4c4c4c 100%); /* FF3.6+ */

etc., etc.

}

My question: what on earth is STOPbody? 

TIA....