The most common and widely recognized symbol for microwave safe is a set of three wavy horizontal lines stacked on top of each other, resembling radio waves. This symbol indicates that the container is safe to use in the microwave as it can withstand the heat without melting, warping, or releasing harmful chemicals. Variations of this symbol sometimes include a microwave oven icon combined with the wavy lines or simply the text "Microwave Safe." A less common variation shows a dish radiating waves. If a container has this symbol, it assures heat resistance, structural integrity, and chemical safety during microwave use. Conversely, a crossed-out version of this symbol means the container is not microwave safe.

Summary of Microwave Safe Symbols:

• Three wavy horizontal lines (most common)
• Microwave icon with wavy lines
• Text stating "Microwave Safe"
• Dish with radiating waves (less common)
• Crossed-out microwave symbol means not safe for microwave use

Checking for these symbols at the bottom or on the container helps in identifying microwave safe products and avoiding unsafe materials that might melt or leach chemicals when microwaved.