Oh, all right, a zarf is a holder for a hot coffee-cup.
From the independent.co.uk
I loved seeing ZARF, which dates to the Ottoman Empire.
From the wordplay.blogs.nytimes.com
Neither is a zarf, presumably.
From the independent.co.uk
Zarf Enterprises is the source for a range of different adapters, or if you're good at shop and know how to mill metal, you can make your own.
From the scienceblogs.com
I suppose one of those cardboard sleeves that Starbucks uses could even qualify as a zarf, so next time, order a finjan of latte with a zarf and see what the barista says.