'Best' in the Bible

As for this image, its head was made of the best gold, its breast and its arms were of silver, its middle and its sides were of brass,

And lifting up my eyes I saw the form of a man clothed in a linen robe, and round him there was a band of gold, of the best gold:

Then the northern king will come, erect a siege ramp, and capture a fortified city. The southern forces won't prevail not even with their best troops and they'll have no strength to take a stand.

And he will come {into the beautiful land} and many will fall victim, but these will escape from his power: Edom and Moab and the best part of the {Ammonites}.