The familiar trefoil symbol has been used in all kinds of places, including that soda. The "extremely scary" symbol is the fourth image in the Wikipedia page OP

The familiar trefoil symbol has been used in all kinds of places, including that soda. The "extremely scary" symbol is the fourth image in the Wikipedia page OP linked to: > It depicts, on a red background, a black trefoil with waves of radiation streaming from it, along with a black skull and crossbones, and a running figure with an arrow pointing away from the scene. The radiating trefoil suggests the presence of radiation, while the red background and the skull and crossbones warn of danger. The figure running away from the scene is meant to suggest taking action to avoid the labeled material. The new symbol is not intended to be generally visible, but rather to appear on internal components of devices that house radiation sources so that if anybody attempts to disassemble such devices they will see an explicit warning not to proceed any further.