Arcanist Uovril is a high elven arcanist who is the alliance quartermaster for people with Emblem of Frost. His horde counterpart is Magister Arlan.
On gaining Dungeon & Raid Emblem, Arcanist Uovril is the NPC who sends alliance characters the message regarding their use:
Emblem Quartermasters in Dalaran's Silver Enclave
Your achievements in Northrend have not gone unnoticed, friend.
The emblems you have earned may be used to purchase equipment from the various emblem quartermasters in Dalaran.
You may find us there, in the Silver Enclave, where each variety of Emblem has its own quartermaster.
We look forward to your arrival.
Relics, Trinkets and Misc
Patch 3.3.0 (08-Dec-2009): Added