It seems you're asking about the feature. Based on common contexts, this likely refers to a marketing campaign or product variant from Rexona (known as Sure in the UK/Ireland, Degree in the US) involving a bull.

Here are the most likely interpretations and their key features: Rexona has run several commercials featuring a bull (often a rodeo bull or a bull in a china shop) to demonstrate the extreme effectiveness of their antiperspirant.