War Ribbon (5e Equipment)
From D&D Wiki
Simple Melee Weapons
A battle ribbon is a strip of thin cloth (usually silk or satin), 15 to 20 feet long, and usually attached to a short stick or piece of bamboo. Tiny pieces of sharp metal are woven into the edge at intervals, allowing a skilled wielder to slash at foes. There are fighting styles that combine rhythmic gymnastics with martial art forms.
If you are proficient with martial melee weapons, you can use a ribbon to entangle.