Valaróma
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"The Valaróma is
the name of his great horn, the
sound of which is like the upgoing of the Sun in scarlet, or the sheer
lightning cleaving the clouds."
"Valaquenta", Silmarillion
Oromë
's horn, Valaróma, could be heard above all other horns, and
when the Eldar
heard it they knew the hunter was once again pursuing the servants of
Morgoth.
References: The Silmarillion