'Single' in the Bible

The Chaldeans answered the king directly, "There's not a single man on earth who can do what the king has commanded. No king, lord, or ruler has ever asked such a thing from any diviner, enchanter, or Chaldean.

“You, O king, were looking and behold, there was a single great statue; that statue, which was large and of extraordinary splendor, was standing in front of you, and its appearance was awesome.

Then I raised my eyes and looked, and behold, there in front of the canal stood a [lone] ram (the Medo-Persian Empire) which had two horns. The two horns were high, but one (Persia) was higher than the other (Media), and the higher one came up last.