Revelation 11:15

sounded--with his trumpet. Evidently "the LAST trumpet." Six is close to seven, but does not reach it. The world judgments are complete in six, but by the fulfilment of seven the world kingdoms become Christ's. Six is the number of the world given over to judgment. It is half of twelve, the Church's number, as three and a half is half of seven, the divine number for completeness. BENGEL thinks the angel here to have been Gabriel, which name is compounded of El, GOD, and Geber, MIGHTY MAN (Rev 10:1). Gabriel therefore appropriately announced to Mary the advent of the mighty God-man: compare the account of the man-child's birth which follows (Rev 12:1-6), to which this forms the transition though the seventh trumpet in time is subsequent, being the consummation of the historical episode, the twelfth and thirteen chapters. The seventh trumpet, like the seventh seal and seventh vial, being the consummation, is accompanied differently from the preceding six: not the consequences which follow on earth, but those IN HEAVEN, are set before us, the great voices and thanksgiving of the twenty-four elders in heaven, as the half-hour's silence in heaven at the seventh seal, and the voice out of the temple in heaven, "It is done," at the seventh vial.

— Jamieson-Fausset-Brown Commentary (public domain)