The Greek arkos (ἄρκος) means 'bear' — the large carnivorous mammal. It appears in Revelation 13:2 where the beast from the sea has 'feet like those of a bear' — combining lion-like mouth, bear-like feet, and leopard-like appearance. This composite beast draws on Daniel's vision of four great beasts representing world empires (Dan 7).
The bear in biblical imagery is a symbol of terrifying, unstoppable power. David killed both lion and bear to protect his flock (1 Sam 17:34-36) — a foreshadowing of Christ, the Good Shepherd who lays down His life. In Proverbs 17:12, a 'bereaved bear' is one of the most dangerous forces in nature. Daniel's bear-like empire (Medo-Persia, Dan 7:5) was told to devour much flesh. In Revelation 13, the composite beast — bearing dragon-authority, leopard speed, bear strength, and lion speech — represents the totality of anti-God human empire. The answer to such power is not counter-power but the Lamb who conquers through suffering (Rev 5:5-6). The Lion of Judah overcomes not as a bear but as a slain Lamb.