Sum 3
Sum 3 is three ones, the rarest result when rolling three dice. Tradition counts it among the most favorable: what happens rarely is read as a sign.
Interpretation
Three ones mean unexpected luck and the swift fulfillment of what you want. In most collections this is a straight “yes,” with no caveats: the matter will resolve itself, and sooner than you expected.
A second reading is the start of something new: three ones as three beginnings. If the question was whether to take something on, the answer is yes.
Probability
Three dice give 216 equally likely outcomes (6 × 6 × 6). A sum of 3 comes from 1 of them, or 0.46%.
It is one of the two rarest sums: it can only be rolled one way — three identical faces.
The closer a sum is to the middle, the more often it comes up, and the traditional interpretations take this into account: the extreme sums have the sharpest meanings.
Advice
Act without delay. If you were asking about something you keep putting off, this is exactly the case where it is worth starting today.