I needed to know some Lego terminology.† The standard pieces are called bricks. The little nubs on the top are called studs. Bricks are described by their array of studs, so the standard piece that everyone knows is the “2x4 brick”.
Underneath a 2x4 brick are 3 tubes. These define 8 spaces for studs to fit into, and those are called anti-studs.
The pieces that are thinner than bricks are called plates, the thin ones with studs are called tiles.
If you want way more Lego trivia check out this page from Gizmodo.
It’s all good, if you’re into it (and like I wrote, I do have an ulterior purpose). But the one truly insightful thing was this:
Q. I want you to ask the Lego gang for the definitive answer on the plural for Lego bricks. Is it, as we Brits say, simply Lego, or is it, as some Americans insist, Legos?
A. Actually both the Brits and the Americans are wrong—but are all forgiven! "Lego" is an adjective and is not meant to be a standalone name. It should always be Lego bricks, Lego building, Lego products, etc. [emphasis added]
† I am doing a video for a class where Lego bricks are used as stand-ins for various components of the economy.