1 repetition maximum. A rep being one of a movement type.

Like benching 225 12 times would be 12 reps at 225, for a set of 12.

1 rm or rep max would be the most weight you can lift a single time.

Men who have the same 12 repetition maximum (the most weight they can lift 12 times in a row) as women, will have a higher 1 rep maximum then women. Women seem to have better endurance relative to their maximal strength, while men have better power relative to their lifting endurance.

Female Olympic athletes are just much better at handling total training volume relative to 1rm then men are.

IE attempting 5 reps at 95 percent of 1rm could be possible for women. For men it's likely they would fail after 2 reps and begin to risk serious injury.

The tldr is that women are more resistant to fatigue then men while lifting heavy, but men are capable of producing more power with equal muscle mass. Part of it is cns, part hormones. Women who take steroids still can't equal 1rm of steroid free men when muscle mass is the same.