In the US usage, "legos" refers to many blocks. "Lego" is generally used as an adjective, referring to things constructed from many legos. "Lego house" or "Le

In the US usage, "legos" refers to many blocks. "Lego" is generally used as an adjective, referring to things constructed from many legos. "Lego house" or "Lego car", for example. It has been a while since I played with them, but to refer to a single brick, I would usually mention the size. "The red 2x4", for example, to refer to a red lego brick that has 8 pips.