Aam is a wording that includes every member within the class it names, without stating a fixed count.
• الرِّجَالُ: all the men within the intended scope.
• الْمُسْلِمُونَ: all the Muslims within the intended scope.
• مَنْ can mean “whoever” and include every person who meets the stated condition.
• مَا can mean “whatever” and include every non-human thing that meets the stated condition.
Aam does not mean “everything without any boundary.” Its boundary comes from the wording itself.