whisper number
n.— Note: A rumor about a company’s financial performance, plans, deals, etc. «Pre-election, Blair’s Labor Party held a 166-seat majority in Parliament. The betting was on how big a majority he would keep, with the general consensus—in Wall Street parlance, “the whisper number”—being 100 seats.» —“With Dictators Like Hugo Chavez, Who Needs to Make It Up?” by Jeff Matthews Jeff Matthews Is Not Making This Up May 6, 2005. (source: Double-Tongued Dictionary)