Exactly. In English "Lego" is a mass noun, like water and sand. We say "a piece of lego" or "a lego piece" to identify a single brick. I guess in American they

Exactly. In English "Lego" is a mass noun, like water and sand. We say "a piece of lego" or "a lego piece" to identify a single brick. I guess in American they don't treat it as a mass noun, and maybe they say "a lego" instead of "a piece of lego".