A Christmas tree is a fir tree, or an artificial tree that looks like a fir tree, which people put in their houses at Christmas and decorate with coloured lights and ornaments. Evergreen tree, usually decorated with lights and ornaments, to celebrate the Christmas season. The use of evergreen trees, wreaths, and garlands as symbols of eternal life was common among the ancient Egyptians, Chinese, and Hebrews. The Christian symbol can be traced to a German medieval play about Adam and Eve, which included the "paradise tree," hung with apples. The modern, decorated version was widespread among German Lutherans by the 18th century. Brought to North America by German settlers in the 17th century, it had become widespread there by the mid-19th century. It was popularized in 19th-century England by Victoria's consort, the German Prince Albert of Saxe-Coburg
The system of pipes, valves, gauges and related equipment that is located on the well at ground level and that controls the flow of gas and other petroleum products produced from the well
Also called the Tree, it is the noticeable electronic starting device between the lanes on the starting line It displays a calibrated-light countdown for each driver
An assembly of valves mounted on the casinghead through which a well is produced The Christmas tree also contains valves for testing the well and for shutting it in if necessary