Banneton?

9 inch Banneton Proofing Basket Set - for Professional & Home Bakers (Sourdough Recipe) Bowl Scraper & Brotform Cloth Liner for Rising Round Crispy Crust Baked Bread Making Dough Shape Loaf Boules

Its French.
"Bread proofed in a Banneton retains the distinct patterns of the basket, adding a unique and attractive design to the loaf"

The Panera Bread Cookbook: Breadmaking Essentials and Recipes from America's Favorite Bakery-Cafe