In my unfortunately extensive experience with legal matters as a non lawyer, there really aren’t many legal terms with material
reduction in meanings when used legally. For the most part, like in medicine, a less commonly used word is used instead (often in another less commonly used language, such as Latin).
For example, most people would consider a contract to be something written down that says ‘contract’. A few know it can be verbal too.
When really, it could be verbal, video, scrawled in blood on the side of a fence, or any number of other forms, and really covers any agreement that meets certain criteria (generally that there is some form of payment or consideration, an offer, and an acceptance - think ‘quid pro quo’ or something for something).
99% of the time, the public is right. The other times, something went really wrong somewhere and someone did something pretty weird and dumb for it to matter.
In engineering, physics, math, it’s not uncommon to need SOME unique identifier for the thing, and there are very specific technical needs for it to even have a conversation on the topic - and often we’ve run out of pronounceable or recognizable symbols, alternative alphabets, etc.
So down spin quark it is.