Where does “plusstegn” come from?

plusstegn (Norwegian Bokmål) comes from Norwegian Bokmål tegn, from Danish tegn, from Old Danish thæghæn, from Old Norse þegn, from Proto-Germanic þegnaz, from Proto-Indo-European teḱ- — to sire, beget.

plusstegn (Norwegian Bokmål): a plus sign

Definitions

a plus sign

Ancestry of “plusstegn”, step by step

plusstegn traces back through two separate lines of ancestry.

via Norwegian Bokmål tegn

Step	Language	Word	Meaning
1	Norwegian Bokmål	tegn	a sign; a character; imperative of tegne
2	Danish	tegn	sign; token; character
3	Old Danish	thæghæn	—
4	Old Norse	þegn	thane, franklin, freeman, man; a good man;...
5	Proto-Germanic	þegnaz	retainer, servant
6	Proto-Indo-European	teḱ-	to sire, beget

via Norwegian Bokmål pluss

Step	Language	Word	Meaning
1	Norwegian Bokmål	pluss	plus
2	Latin	plūs	more; more of
3	Old Latin	plous	—
4	Proto-Indo-European	ploh₁is-	—

Every word from Proto-Indo-European teḱ- →Every word from Proto-Germanic þegnaz →Every word from Old Norse þegn →