Uncommon
The following are associated with severe disease:

Grey-Turners sign (hemorrhagic discoloration of the flanks)
Cullens sign (hemorrhagic discoloration of the umbilicus)
Pleural effusions (fluid in the bases of the pleural cavity)
Grünwald sign (appearance of ecchymosis, large bruise, around the umbilicus due to local toxic lesion of the vessels)
Körtes sign (pain or resistance in the zone where the head of pancreas is located (in epigastrium, 6–7 cm above the umbilicus))
Kamenchiks sign (pain with pressure under the xiphoid process)
Mayo-Robsons sign (pain while pressing at the top of the angle lateral to the erector spinae muscles and below the left 12th rib (left costovertebral angle (CVA))
Mayo-Robsons point – a point on border of inner 2/3 with the external 1/3 of the line that represents the bisection of the left upper abdominal quadrant, where tenderness on pressure exists in disease of the pancreas. At this point the tail of pancreas is projected on the abdominal wall.
Biphasic stridor (occurring during both the inspiratory and expiratory phases) indicates narrowing at the level of the glottis or subglottis, the point between the upper and lower airways. See also
Crackles (also called "crepitations" or "rales")
Rhonchi
Squawk (sound)

References
Further reading
Godfrey S, Uwyyed K, Springer C, Avital A (Mar 2004). "Is clinical wheezing reliable as the endpoint for bronchial challenges in preschool children?". Pediatric Pulmonology. 37 (3): 193–200. doi:10.1002/ppul.10434. PMID 14966812. S2CID 25264776. External links

Audio Breath Sounds - Multiple case studies with audio files of lung sounds. R.A.L.E. Repository - sound files of breath sounds