I believe it's a shortening of Micro -> m3o with the 3 representing the number of removed letters. In the style of Kubernetes -> k8s, accessibility -> a11y, etc

I believe it's a shortening of Micro -> m3o with the 3 representing the number of removed letters. In the style of Kubernetes -> k8s, accessibility -> a11y, etc. You can find out more about Micro at https://micro.dev https://micro.dev and https://github.com/micro https://github.com/micro (I am not affiliated).