The Greek noun murias means ten thousand or a myriad — and by extension, an innumerable, uncountably large number. It is used literally of 10,000 talents in the parable of the unforgiving servant, and symbolically in Revelation for the vast multitudes in the heavenly throne room.
Murias captures the immensity of both debt and praise. In Matthew 18:24, the servant owed 10,000 talents — an astronomical, unpayable sum — representing the immensity of human sin-debt before God. In Hebrews 12:22 and Revelation 5:11, the muriades muriadon ('myriads of myriads') of angels and the redeemed praise the Lamb. The contrast is stunning: the debt that no human could pay was canceled by Christ, freeing those debtors to join the infinite chorus of praise.