Understanding Symbols: Emergency Stop | In Compliance Magazine Sep 30, 2015Understanding Symbols: Emergency Stop. One of the critical building blocks for your product’s safe design is the proper use of color-coding and symbols. This article will explore the new developments that have occurred in the field of marking emergency stop actuators. The need to correctly identify emergency stop actuators designed.. Emergency Switches - Electrical Symbols Emergency Switches Search for any Electrical, Pneumatic, Hydraulic or Electronic Symbols Click on any electrical, electronic, pneumatic or hydraulic symbols to download, in DWG, DXF and VSS format.