Here are a few possibilities:
* Epsilon (ε): This is a common Greek letter used to designate stars within constellations. You might be thinking of a star with "Epsilon" in its full name, like Epsilon Eridani or Epsilon Aurigae.
* Sirius: The brightest star in the night sky is called Sirius. It is often referred to as the "Dog Star."
* Arcturus: Another bright star, Arcturus, is the fourth brightest star in the night sky.
Could you please provide more context about where you encountered this "Eplion" name? This might help me understand what you're looking for.