What do the ten horns symbolize? (Revelation 12:3)

And there appeared another wonder in heaven; and behold a great red dragon, having seven heads and ten horns, and seven crowns upon his heads.

Revelation 12:3 - King James

⚪ 10 powers (kingdoms)
⚫ The Evil One controls all the governments and nations of the earth
⚫ Power (invisible + visible) and authority of Satan

⚪ 10 powers (kingdoms)

Rev. 12 [...]
Having seven heads and ten horns. — See Dan. 7:7, 20; Rev. 13:1; 17:3, 9-12; 5:6; 1 Sam. 2:10; Deut 33:17; 1 Ki 22:11. The Eastern, or Byzantine Empire, was founded in A. D. 395, when Theodosius divided the Roman Empire between his two sons, Honorius and Arcadlus, assigning to the latter all the portion lying east of the Adriatic sea. At this time the Roman Empire became the two legs of Nebuchadnezzar's vision. At the time the division was made the five potential races in the East were the Greeks, Lombards, Ostrogoths, Herull and Vandals. The five potential races in the West were the Franks, Britons, Saxons, Visigoths and Suevi During the next one hundred and fifty years great migrations and invasions have so confused history that there is great difference of opinion among historians on many important details. It is plain, however, that three of the migratory races disappeared from history, all within a few years of each other, apparently in order to leave Rome and its environs free for the development of the papacy. The Herull, a race from Germanic territory, disappeared from Italian territory in A. D. 489; the Vandals, a race from the shores of the Baltic (never In control of Rome except on a brief raid, but a great enemy of the papacy) disappeared in A. D. 634; and the Ostrogoths, an Asiatic race, In A. D. 639. The Western Empire itself disappeared in A. D. 476. The matter is treated by Pastor Russell at greater length In C 76, 77, and all his statements are, of course, correct.

Source : 🇺🇸 1917 - Studies in the Scriptures, Vol 7, The finished mystery, page 184 + Cover

(Rev.xii.) [...]
(V. 3). The Roman Empire had seven heads (Rome’s seven successive and distinct forms of government), and ten horns (divisions of power).

Source : 🇺🇸 1879 - Zion's Watch Tower, December 1879, p 2-7 - [55]

⚫ The Evil One controls all the governments and nations of the earth

The “seven heads” represent that the Evil One has exercised complete invisible power over the nations of earth; while the “ten horns” symbolically represent that he controls all the governments and nations of the earth. “Seven” is a symbol of things complete, of things that are invisible, while “ten” is a symbol of the completeness of things visible. Therefore the two together show that before the beginning of the fight and at the birth of The Government. The Devil exercised complete power in heaven (invisible) and in earth over the nations of the earth.

Source : 🇺🇸 1928 - Government, page 179 + Cover

⚫ Power (invisible + visible) and authority of Satan

Rev. 12 [...]
The diadems were upon his seven heads, and he had "ten horns", symbolically representing complete invisible and visible power and authority over his organization, whereas the "seven heads" symbolically represented his complete invisible organization.

Source : 🇺🇸 1930 - Light, Vol 1, page 234 + Cover