Dragon = satan/devil
Beast = governing body/system lead by the anti-christ who will rule the world
Sea = a population of individuals (from which emerges the Beast)
Therefore the unholy trinity is as follows:
1. Dragon
2. Beast
3. False Prophet
Revelation 13 King James Version (KJV)
4 And they worshipped the dragon which gave power unto the beast: and
they worshipped the beast, saying, Who is like unto the beast? who is
able to make war with him?
In Rev 13:4, we read that the dragon (satan) was worshipped which gave power to the beast (political leader). The beast is symbolic of both a single person and an entire governing political entity/system.
Revelation 13 King James Version (KJV)
13 And he doeth great wonders, so that he maketh fire come down from
heaven on the earth in the sight of men,
14 And deceiveth them that dwell on the earth by the means of those miracles
which he had power to do in the sight of the beast; saying to them
that dwell on the earth, that they should make an image to the beast,
which had the wound by a sword, and did live.
The beast is the false messiah, the counterpart to Lord Jesus Christ (messiah). The false prophet can be likened to the counterpart to John the Baptist. The false prophet performs miracles and signs to legitimize the beast as messiah. In Rev 13:13 we see that the false prophet brings down fire from the sky as a sign before a multitude.
Revelation 19 King James Version (KJV)
19 And I saw the beast, and the kings of the earth, and their armies, gathered together to make war against him that sat on the horse, and against his army.
20 And the beast was taken, and with him the false prophet that
wrought miracles before him, with which he deceived them that had
received the mark of the beast, and them that worshipped his image.
These both were cast alive into a lake of fire burning with brimstone.
In Rev 19:20, we read that the false prophet that was responsible for making miracles evident to the multitude in order to give credibility to the beast, will be cast into the lake of fire. Both the beast and false prophet will be there, placed there by Jesus Christ Himself.