This is the 601st most frequent Icelandic word.
örn
"Eagle."
Here, 'örn' is used as a noun meaning 'eagle', a bird of prey.
Ég sá örn fljúga yfir fjöllin.
I saw an eagle flying over the mountains.
In this sentence, 'Örninn' is the definite form of the noun 'örn', referring specifically to 'the eagle'.
Örninn er sterkur fugl með beittar klær.
The eagle is a strong bird with sharp claws.
Here, 'Þeirra liðið er kallað Örninn' uses 'örn' metaphorically, representing strength and power, and being used as a proper name or title.