i Register
In some senses, fn is marked as informal. Watch for register when choosing this word.
FN + NOUN
diagnosis
PREP.
on
noun
Initialism of footnote.
name
Abbreviation of Fabrique Nationale de Herstal.
noun
Initialism of fibronectin.
A FN diagnosis, on the other hand, can give a patient the illusion of good health (and the patient will not get the necessary treatment).
WiktionaryFrom the optics of fairness, we care more about FPs than FNs because it's more unfair to put an innocent person in prison than it is to leave a guilty person in the streets.
Wiktionaryi Register
In some senses, fn is marked as informal. Watch for register when choosing this word.