Identify the item tied to the front door of the coffee house in Fever 1793.

Upon recovering
from the yellow fever at Bush Hill, Matilda and her grandfather return to the Cook Coffeehouse,
the business run by her family in the heart of Philadelphia. They discover a yellow piece of
fabric tied to the handle of the front door. This yellow fabric is understood in the community
as the symbol that someone within the residence has contracted yellow fever. Before Mattie and
her grandfather left the city in an effort to escape the epidemic, Mattie's mother had been
recovering from yellow fever above the coffeeshop, where Mattie and her family resided. Upon
their return, however, her mother is nowhere to be found. Additionally, the coffeehouse has been
ravaged by thieves and looters, but the upstairs has remained untouched.