IKEA also frequently use first names (for people), e.g. Billy or Erik, and even abstract words, e.g. Poäng (point, as in &quot;that&#x27;s a good point&quot;.).<p>As for jf: I searched through the pdf of a 1300 page Norwegian dictionary, and the single word in there containing jf is the abbreviation &quot;jfr.&quot; which is the same as the abbreviation &quot;cf.&quot; (confer) in English. So jf appears to be a very good choice.