Limits in requests for CPU resources are measured in CPU units. One CPU, in Kubernetes, is equivalent to 1 vCPU/Core for cloud providers and 1 hyperthread on bare-metal Intel processors.
Fractional requests are allowed. 0.5 is guaranteed half as much CPU as one that asks for 1 CPU.
The expression 0.1 is equivalent to the expression 100m, which can be read as "one hundred milliCPU".