An E-Marker (electronic marker) is a chip that is used in the latest USB connector iteration, USB Type-C, to communicate between source and sink devices.
E-mark Chip Introduction - USB C Cable Manufacturer-Wandkey
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Baseus USB C Cable, 240W PD 3.1 5A Fast Charging USB C to USB C Charger Cable, Zine Alloy Nylon Braided Type C Cable for iPhone 15/Pro/Plus/Pro Max, MacBook, iPad Pro/Air/Mini
Teledyne LeCroy - RapidWave4000 High-speed Cable Production Tester
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Teledyne LeCroy - RapidWave4000 High-speed Cable Production Tester
Teledyne LeCroy - RapidWave4000 High-speed Cable Production Tester
How to Identify if a USB Type-C Cable Has an E-Marker? – RORO Innovation
USB C cable tester to find out which type of cable you're holding in your hands : r/UsbCHardware
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USB C Charger Cable, 240W Magnetic Type C Charging Cable, USB C to USB C Cable, 3.3ft Type C Fast Charging Cord Nylon Braided Compatible for iPhone