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I was curious as well. Apparently stands for the “Beak of Rome”. Where Schnabel is beak. Everything I found indicates he was a plague doctor during the bubonic plague.

From Wiki:

A plague doctor (Italian: medico della peste, Dutch: pestmeester, Spanish: médico de la peste negra, German: Pestarzt) was a special medical physician who treated those who had the plague.[1] They were specifically hired by towns that had many plague victims in times of plague epidemics. Since the city was paying their salary, they treated everyone: both the rich and the poor.[dubious – discuss][2] However, some plague doctors were known for charging patients and their families extra for special treatments and/or false cures.[3] They were not normally professionally trained experienced physicians or surgeons, and often were second-rate doctors not able to otherwise run a successful medical business or young physicians trying to establish themselves.

In the seventeenth and eighteenth centuries, some doctors wore a beak-like mask which was filled with aromatic items. The masks were designed to protect them from putrid air, which (according to the miasmatic theory of disease) was seen as the cause of infection.

The drawing was supposedly satirical. Likely calling him a quack.