So you know how we have different ways of talking to different people? Like if we talk to little kids, we use simpler words and sentences so they can understand us better. Well, lawmakers and government agencies also have to use specific language when they write rules and regulations, so everyone can understand them.
One particular type of language is called "steelman language." It's a way of writing rules that are really clear and well-written, so that everyone can follow them easily. Steelman language makes rules easy to read for scientists, lawyers, and regular folks like you and me.
The reason we call it steelman language is that it's like building a really strong and sturdy structure out of steel (a type of metal that's really strong). When rules are written in steelman language, it's like building a strong foundation to make sure everyone is following the rules the same way, and that they're all following the same rules.
So, in summary, Steelman language is a way of writing rules that are really clear and well-written, like building a strong structure out of steel, to make sure everyone can understand and follow the rules the same way.