Harrison and Norton in “Unfinished Business”

Norton, does the number three mean anything special to you? [Norton shakes his head] It sure meant something special to the aliens. Think about it. Their ships flew in groups of three; their optics were divided into three units. They attack their targets in three different directions. Even their weapons, the bolas, had three weighted ends. Three, Norton. Think three. I know the answer is there.

Number three. I'll think on it. What have we got to lose, huh?