A bullwhip is a single-tailed whip, usually made of leather and originally used with livestock.

Bullwhip ( single-tailed whip)
Die Reduzierung Des Bullwhip-Effektes: Eine Quantitative Analyse Aus Betriebswirtschaftlicher Perspektive
The bullwhip effect in supply chains
On bullwhip in supply chains—historical review, present practice and expected future impact
Computers Play the Beer Game - Can Artificial Agents Manage Supply Chains?
The Bullwhip Effect in Supply Chains
The application of discrete event simulation and system dynamics in the logistics and supply chain context
Supply chain forecasting – Collaborative forecasting supports supply chain management
Controller design and reduction of bullwhip for a model supply chain system using z -transform analysis
Have U.S. Manufacturing Inventories Really Decreased? An Empirical Study