"Flemish bond and consists of alternating headers and stretchers in every course, so arranged that the headers and stretchers in every other course appear in vertical lines"

"Common or American Bond. Common or American bond is a variation of running bond with a course of full length headers at regular intervals. These headers provide structural bonding, as well as pattern. Header courses usually appear at every fifth, sixth or seventh course."

Source: Technical Notes on Brick Construction, The Brick Industry Association, Technical Notes 30 - Bonds and Patterns in Brickwork, March 1999

Left: Flemish Bond on the Facade, with English Corner.

Right: Common Bond on the Side

Note: the string courses of Brick on both bonds and on both sides.