Named for its resemblance to a Christmas tree, it is fairly bright at an overall magnitude of 3.9; it is 2400 light-years from Earth.
Metapenaeus monoceros (formerly Penaeus monoceros), an Indo-Pacific species and Lessepsian migrant
HD 49976, also known as V592 Monocerotis, is a variable star in the constellation of Monoceros (the Unicorn).