I’m guessing 1L should be 1U
No 1L = 1Litre, a tiny form factor pc, they are bullet proof, can run pretty cool and quiet and low power even though they can pack a punch if you want them too
I have a couple running at the top of my server rack in a 1U mount
but they fit anywhere behind screens
The AMD one is fanless and uses less wattage than a rasberryPi
all the others are intel based 12 thread 8700 and 8 thread 7700 with 64GB ram 10Gb Lan and 2.5Ggb Lan
So they all take full advantage of my connection