Yellow phlegm is normally a sign of an infection, or a case of the common cold. Greenish or brownish phlegm is nearly always a sign of infection. Greenish or rusty phlegm or phlegm with rusty spots can also be a sign of pneumonia. Coughing up brown phlegm is also a common symptom of excessive smoking.
A flowboard is a variation on a skateboard, combining aspects of surfing, skating and snowboarding.
A backboard is a piece of basketball equipment. It is a raised vertical board with a basket attached. It is made of a flat, rigid piece of material, often Plexiglas. It is usually rectangular as used in NBA, NCAA and international basketball.