Haven't got the game yet (well, tonight I do, yay!)
But here's what the Vault Wiki comes up with:
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LoginPower Armor Training is a Fallout 3 perk. It is necessary in order to operate a suit of Power Armor.
So it seems to be a 'Perk'...
In the SPECIAL character system, Perks are beneficial bonuses the player character picks up from experience. The number of Ranks each Perk has determines how many times the perk can be taken... In Fallout 3, the Perk Rate is always 1 - that is, you can pick a new perk every level. Also, Traits, part of the character system in all previous games, were not included in Fallout 3, and some of them were turned into Perks.
Hope this helps!