Here is a collection of warning signs or labels that may be affixed to various pieces of electrical, electronic and radio equipment, components or installations and what they mean.
Labels may or may not have further information written on them.
If there are any that you think should be included, let me know so I can add them.
The best way to deal with any hazard warning sign is:- If in doubt, Keep Out!
 
| Do Not Touch. This is often found on Electrostatic Sensitive devices but may also mark areas of high temperature or high voltage. See ESD page. 
Electrostatic Sensitive Device. | Use ESD precautions when transporting or handling components or modules marked with this symbol. 
High Voltage. | The 'lightning strike' is used internationally as a general electrical high voltage hazard warning.  
Laser radiation. | Found on CD and DVD players and recorders. Looking at the beam may cause blindness. 
Microwave Radiation. | This warning sign is not intended or necessary for domestic type microwave ovens but may be found on microwave transmitters.  
Radio Frequency Radiation. | These warning signs may be present where transmitters and antennas are radiating Radio Frequency at levels that may be hazardous to health. |
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High Voltage (may indicate voltage level).
Risk of Electric Shock.