What is the name of light given to Frodo by elf queen in The Lord Rings?

The light given to Frodo by the Elf Queen Galadriel in The Lord of the Rings is called the Light of Eärendil.

It is a tiny phial containing a single star, Eärendil's, that is said to shine even in the deepest darkness. Galadriel gives this light to Frodo as a symbol of hope and to guide him on his journey.