Unicorn
There is no constellation named after the unicorn, but there is Pegasus the flying horse from Greek mythology.
The constellation Monoceros and the scientific name for the narwhal [Monodon monoceros] get their names from the mythical animal that's called the Unicorn. In fact, the word 'monoceros' comes from the classical Greek language of the ancient Greeks. The noun means 'one horn'.
Monoceros is a faint constellation located in the celestial equator. Its name means "unicorn" in Greek, and it is often depicted as a mythical unicorn. Monoceros is best known for its association with the bright star Beta Monocerotis.
monoceros
The constellation known as the Unicorn is Monoceros. It is located near the celestial equator and is not very prominent in the night sky.
monoceros
It's the unicorn.
You can see the constellation Monoceros in the celestial equator region of the night sky. It is located near the Orion constellation and can be visible in the northern hemisphere during winter months.
Monoceros' primary star - Alpha Monocerotis - is 144 light years from Earth.
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Billions or trillions
Billions or trillions of stars, just like any other constellation. A constellation is basically a general direction in space.