Apocalypse Revealed #365
365. Of all nations, tribes, peoples, and tongues. This symbolizes all in the Christian world who have some religion springing from goodness and are guided by truths from doctrine.
All nations and tribes mean people who have some religion springing from goodness, who are those of the lowest heaven (no. 363) - nations meaning people prompted by goodness (nos. 920, 921), and a tribe, religion (no. 349). Peoples and tongues mean people who are guided by truths from doctrine - peoples meaning people guided by truths (no. 483), and a tongue, doctrine (no. 282).
Thus "all nations, tribes, peoples, and tongues," taken together, symbolize in the spiritual sense all people who have some religion springing from goodness and are guided by truths from doctrine.