<unk> in pulmonology is one of two<unk> s named for Charles Franklin<unk> . It refers to inward movement of the lower rib cage during inspiration, - instead of outward as is normal - implying a flat, but functioning, diaphragm, often associated with COPD. COPD, and more specifically emphysema, often lead to hyperexpansion of the lungs due to air trapping. The resulting flattened diaphragm contracts downwards on inspiration, thereby paradoxically pulling the inferior ribs inwards with its movement.
Hoover's sign 
Lockwood's sign
Bing's sign
Fothergill's sign
Adson's sign
Pratt's sign
Dance's sign
Battle's sign