What is the meaning of Christmas_tree?

A conifer used during the Christmas holiday season, typically decorated with lights and ornaments and often a star or angel at its tip.

Anything elaborately ornamented or decorated.

A pole with lights, similar to a traffic signal, used for signalling the start of an automobile race.

The collection of valves sometimes found at the top of a working oil well.

A pattern of muscles visible in the lower back, resembling in outline the shape of a conifer.

A type of alert area constructed by the Strategic Air Command of the United States Air Force during the Cold War.

A panel of indicator lights in an aircraft or a submarine.

Source: wiktionary.org