Engineering glossary

The little ring of copper around a drilled hole. If it's too thin, the drill can break out of the pad and ruin the connection — like a hole punched too close to the paper's edge.

A special board that connects a testing machine to the chip being checked, passing signals back and forth — like a docking station between the tester and the part.

Carefully sizing the copper wires so fast signals travel smoothly without bouncing back — like keeping a pipe an even width so water flows without banging.

How thick the copper wiring is, oddly measured by weight. Thicker copper carries more electricity — like a wider water pipe handles more flow.

A reality check that makes sure a design can actually be built by a specific factory — like a builder reviewing house plans before construction to catch problems early.

A thin gold-over-nickel coating on the copper pads that keeps them flat and rust-free so parts attach cleanly — like a protective topcoat that never tarnishes.

A set of picture files that show the factory exactly what each layer of the board should look like — like a stack of blueprints, one per floor of a building.

The gold-plated stripes along a board's edge that plug into a slot, tough enough to be inserted thousands of times — like the metal contacts on a memory card.

A cheap way to coat the copper pads by dipping the board in melted solder and blowing off the extra with hot air — leaving a slightly bumpy but ready-to-solder surface.

A standard connection list that lets a testing machine check a blank board is wired correctly — like an answer key any tester, from any brand, knows how to read.

A tiny laser-drilled tunnel that links two stacked layers of the board so wiring can pass between them — like a small elevator between two floors of a building.

A checklist of every connection on the board — which points are supposed to be wired together — so the factory can confirm nothing is missed or accidentally joined.

One smart file that packs the layer pictures, the wiring list, and the parts info all together — like a single project folder instead of a pile of loose printouts.

Grouping many copies of a board onto one big sheet so the factory makes them all at once, then snaps them apart — like baking a whole tray of cookies instead of one.

The colored coating (usually green) covering the board that protects the copper and leaves bare only the spots where parts attach — like paint with a few gaps left on purpose.

Putting the tiny layer-to-layer tunnel right inside the spot where a part sits, then filling it flat so it still solders cleanly — a space-saver for very crowded chips.