[whswhs]

The swordsman's callouses, or the lutenist's. The dyer's stained fingers. The distinctive odors of many trades (Turtledove and Tarr discuss a man who uses urine professionally as a mordant, for example). Bow legs for certain occupations.

Sherlock Holmes observes the flattening of a young woman's fingertips and concludes that she may be either a pianist or a typist.