Coming from the Greek word "Ametathetos," which means unaltered, and unchanged, it is used as a figure of speech wherein, despite the situation changing in a sentence, a numerical value tied to it stays the same.
"She unblocked him, so his chances of getting with her went from zero percent to zero percent."
"Ametatos is a figure of speech wherein, despite a situation changing, the numerical value tied to it stays the same."