This is the 41st most frequent Icelandic word.
hann
"He" or "it" (masculine pronoun).
The word 'hann' is used as the subject pronoun meaning 'he' in the embedded clause.
Bókin sem hann hafði skrifað er frábær.
The book that he had written is excellent.
The word 'hann' acts as the subject pronoun meaning 'he' in the nominative case.
Hann er góður kennari.
He is a good teacher.
The word 'hann' functions as the object pronoun meaning 'him' in the accusative case.