This looks identical to a USB C. Thunderbolt 3 cables and ports are usually labeled with an arrow that is shaped like a lightning bolt. The style of lightning bolt should look like the lightning bolt on the product listed below.
Thunderbolt is a proprietary connector developed by Intel.
"Because the USB-C connection is proving to be very popular, the latest version of the connectivity specification called Thunderbolt has formally adopted USB-C as its physical hardware. That means you can use any Thunderbolt 3 cable as a USB-C cable, and any Thunderbolt 3 port can use a USB-C cable.
Thunderbolt 3 devices can use any USB-C cable. But USB-C cables vary. Thunderbolt 3 can transfer data up to 40 Gbps – you can get this speed with official Thunderbolt 3 cables or a good-quality USB-C cable that's less than about 1.6 feet in length. USB-C cables longer than 1.6 feet may top out at 20 Gbps, depending on their quality." Business Insider on June 5 2020