SPE Single Pair Ethernet. This are two standards for 10Mbps. 10Base-T1L and 10Base-T1S
More details on these webpages:
https://blog.teledynelecroy.com/2022/08/10base-t1s-automotive-ethernet-vs.html
CAN XL vs 10BASE-T1S
10Base-T1S hat for Raspberry Pi:
https://www.skpang.co.uk/collections/hats/products/pican-fd-board-with-10base-t1s
10Base-T1L hat for Raspberry Pi:
https://www.skpang.co.uk/collections/hats/products/pican-fd-board-with-10base-t1l-for-raspberry-pi