Above the angel’s arm is a three-part leaf. When the outer, left tip of the leaf is marked out, the card is a heart. The central upper tip is for clubs; the inner, right tip is for diamonds; no marking signifies spades.

With sharp eyes the Bicycle and Aviator markings can be read passably well at arm’s length. The Bee markings are slightly more difficult to read. Persons aware of the markings but not of their precise location may take several minutes to find the marks.

From: Big Secrets
by: William Poundstone