Behind the song · udi · identification · regulation
Two Halves of My Name: A Device's Own Two-Part ID Number
The song behind the identifier every regulated device carries — one half fixed forever, one half new with every batch.
In short
- Every regulated device's Unique Device Identifier has two parts: a fixed half naming the maker and model, and a variable half covering things like lot number and expiration.
- The variable half changes with every production run.
- Both halves are submitted to a searchable federal database, letting problems be traced to a specific batch rather than an entire model line.
"Two Halves of My Name" is sung from a slightly unusual point of view: the device itself, introducing its own identity the way a person might introduce their name and their birthday. That framing isn't just a songwriting trick — every regulated device really does carry an identifier built from two distinct parts, and the song's whole structure follows the actual shape of that number.
Where the song came from
The real system behind the song is the Unique Device Identifier, or UDI, and it genuinely has two halves. The first is a fixed Device Identifier that names the maker and the model and never changes. The second is a conditional, variable Production Identifier — lot number, batch, expiration date — that changes with every single production run. That's the exact split the song's chorus sings: "lot number, birth day, the day I must go" answering "one always the same." It isn't poetic license; it's a fairly literal description of how the identifier is actually built.
Both halves get submitted to a federal database where the identifier is searchable — the "one big book" the second verse references, where "they never lose the score." In practice, that database lets a hospital, a manufacturer or a regulator trace a specific device, down to its production batch, back through its entire supply chain, which matters enormously the moment a batch-specific problem or recall needs to be tracked to the exact units affected rather than an entire model line.
Before a shared identifier system like this existed, tracing a specific unit could mean digging through purchase orders, serial-number stickers and whatever paperwork happened to survive in a hospital's own files, with no guarantee any two hospitals recorded the same details the same way. A number built from two standardized halves, submitted to one searchable place, turns that patchwork into something closer to a lookup: the fixed half answers "what is this," the variable half answers "which exact one," and together they answer a question that used to take a phone call and a hunt through a filing cabinet.
One name, two stories
The song leans into the tension between those two halves as its emotional center — one half of a device's identity that never moves, and one that's rewritten with every batch it's born into. It's an odd angle for a love song, admittedly, but it captures something true about how regulators think about identity for a device: half permanence, half traceability, and both halves required before anything ships. Told from the device's own voice rather than a technician's or a regulator's, the split even reads a little like an origin story: one name given at birth, and a second identity earned, batch after batch, every time it's made again.
Two halves of my name, one always the same,one that keeps on changing with every game,lot number, birth day, the day I must go,two halves of my name, and the whole world will know.
Sources
- UDI Basics, U.S. Food and Drug Administration
