CSA White Rectangle

The CSA White rectangle with orange Greek letter omega – Ω – indicates soles that provide resistance to electric shock. Such certified footwear contains a sole and heel design assembly that, at the point of manufacturing, has electrical insulating properties to withstand 18,000 Volts and a leakage current not exceeding 1mA for 60 seconds.

https://workauthority.ca/pages/safety-symbol-index