Rey (Matis Rei, born November 21, 1986 in Kuressaare, Saaremaa, Estonia), is a human beatbox artist and multivocalist from Estonia. He is more known in Scandinavian and Baltic countries. For live performances Rey appears with DJ 69 (Estonian DJ Battle 2005 champion) and Teele Viira.

Rare Earth Y Zeolite. A cracking catalyst component made by ion exchanging rare earth (lanthanide) metals into sodium Y molecular sieves. See Rare Earth, Type Y Zeolite.