How did 'style' signify names of court cases?

Can you please expatiate on ohwilleke's answer? She asseverated

My suspicion is that the Latin/French word for a writing instrument ends up being used for the act of using a writing instrument to place a name upon something, which in turn comes to mean the name written as a result of this act, which in turn comes to mean any name.

1. But how does the Old French noun stile semantically shift to signify "the act of using a writing instrument to place a name upon something"?

2. Then how does "the act of using a writing instrument to place a name upon something" semantically shift to signify "the name written as a result of this act"?

These semantic shifts haven't happened to common English nouns for writing instruments, like pencil or pen, both of which don't signify names.

Style of Cause (Rule 3.3)

The style of cause is the title of the case or the names of the parties involved in the action.

Maureen F. Fitzgerald, BComm (Univ. Alberta), JD (Univ. Western Ontario), LLM with Merit (London School of Economics), PhD (University of British Columbia). Legal Problem Solving – Reasoning, Research and Writing (2019 8e), p 223.

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