how to see dc operating region names in cadence DC annotation for MOSFET
You can map the 5 regions as follow:

0 cut-off

1 triode

2 sat

3 subth and 4 breakdown

Source for this information, "http://community.cadence.com/cadence_technology_forums/f/38/t/14626"

Its just encoded that way and you can just know which region it is from the above information, which solves its purpose.