Thief (birthsign)

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A person born under the Thief birthsign grants a 10-point bonus to Agility, Speed, and Luck attributes. These bonuses are temporary, once the respective attributes reach 100 this sign has essentially no effect. Best fit for a stealth gameplan.

The Thief's 10 point bonus to Luck makes it much easier for the player to boost all of the attributes to 100 in the long run.

(Summary and picture from Official Elder Scrolls Site)

[edit] Usefulness

The thief provides the biggest attribute boost in the game. No skill modifies luck so boosting luck is great. Luck effects Marksman Expert, and Mastery perks as well as pickpocketing and sneaking. Choose this birthsign along with Luck as a favorite attribute, and you can easily get your luck up to 100. The thief is great for sneaky character builds.