I've sometimes heard "orphan" used to represent a single word left alone on its own line at the end of a paragraph, but the terms are often confused and Carter could have used "widow" in that sense.
I'm curious to see what the hard-copy scripts actually looked like. The soft copies I've seen aren't particularly idiosyncratic but maybe they've been normied: https://www.dailyscript.com/scripts/the-x-files_production.h...