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  2. Christmas tree (aviation) - Wikipedia

    en.wikipedia.org/wiki/Christmas_tree_(aviation)

    A "Christmas tree" was a type of alert area constructed by the United States Air Force for the Strategic Air Command ( SAC) during the Cold War. Oftentimes, bombers or tanker aircraft were stationed next to a readiness crew building (RCB), also known as "mole hole" facilities. The alert apron, also known as an alert ramp, received the name ...

  3. Hanukkah bush - Wikipedia

    en.wikipedia.org/wiki/Hanukkah_bush

    Hanukkah bush. A Hanukkah bush that some Jewish families display in their homes for the duration of Hanukkah and Christmas. [1] [2] It uses a Star of David rather than any Christian-themed decorations. A Hanukkah bush is a bush or tree —real or artificial—that some Jewish families in North America display in their homes for the duration of ...

  4. Christmas tree (oil well) - Wikipedia

    en.wikipedia.org/wiki/Christmas_tree_(oil_well)

    Christmas tree (oil well) Oil well Christmas tree. In petroleum and natural gas extraction, a Christmas tree, or tree, is an assembly of valves, casing spools, and fittings used to regulate the flow of pipes in an oil well, gas well, water injection well, water disposal well, gas injection well, condensate well, and other types of well.

  5. NGC 2264 - Wikipedia

    en.wikipedia.org/wiki/NGC_2264

    NGC 2264 is the location where the Cone Nebula, the Stellar Snowflake Cluster and the Christmas Tree Cluster have formed in this emission nebula. For reference, the Stellar Snowflake Cluster is located 2,700 light years away in the constellation Monoceros. The Snowflake Cluster was granted its name due to its unmistakable pinwheel-like shape ...

  6. Chrismon tree - Wikipedia

    en.wikipedia.org/wiki/Chrismon_tree

    A Chrismon tree is an evergreen tree often placed in the chancel or nave of a church during Advent and Christmastide. [1] [2] The Chrismon tree was first used by North American Lutherans in 1957, [3] although the practice has spread to other Christian denominations, [4] including Anglicans, [5] Catholics, [6] Methodists, [7] and the Reformed. [8]

  7. Christmas tree (drag racing) - Wikipedia

    en.wikipedia.org/wiki/Christmas_tree_(drag_racing)

    Modern drag races are started electronically by a system known as a Christmas tree. A common Christmas tree consists of a column of seven lights for each driver or lane. Each side of the column of lights is the same; from the top down, there are a blue LED light set (top and bottom halves), then three amber bulbs, then a green bulb and a red ...