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Ambassador (player title)
Ambassador is an in-game player title. It was awarded to players who created their accounts on the official Star Trek Online website before October 2009. This was offered by Cryptic to celebrate STO having hit #1 on MMORPG during that month.
It is available in the 'Special Unlocks' section of the C-Store if you are eligible for it. It must be claimed per character to display it.