Below that is a row of four test tubes, marked with a circle, an X, a square and a plus sign.

FORBES: Magazine Article

With four pods arranged in a circle, the Harmony node becomes one of the station's safe havens.

BBC: A space of one's own

Four buttons arrayed in a circle bring up the command menu, play and pause songs, and shift forward and back.

FORBES: IPod's A Winner

Astronomers using the United Kingdom Infrared Telescope (UKIRT) in Hawaii discovered the four star pairs, each of which is a binary system in which two stars circle each other in less than four hours.

MSN: 'Impossible' stars found in our galaxy - Technology & science - Space - Space.com | NBC News

The BRICs, which the Chinese calls jinzhuan siguo, or four golden brick nations, are a way to square that circle.

ECONOMIST: The BRICs

Borel is the only jockey to win the Derby three times in a four-year span, standing in the winner's circle in 2007 with Street Sense, 2009 with Mine That Bird and 2010 with Super Saver.

WSJ: Jockeys Antley, Borel lead racing hall finalists

Rodgers and Hammerstein's South Pacific picked up four Outer Critics Circle awards - outstanding revival of a musical, outstanding director of a musical for Bartlett Sher, outstanding actor in a musical for Paulo Szot and outstanding featured actor in a musical for Danny Burstein.

BBC: US critics give Broadway honours