'Rings' signify the conjunction of good and truth. In Exodus 25:12, 'rings' particularly signify divine truth with divine good.

(Посилання: Arcana Coelestia 9493)

9493. 'And you shall cast four rings of gold for it' means Divine Truth joined to Divine Good, which lie in every direction round about. This is clear from the meaning of 'rings' as the joining together of good and truth, at this point the joining of Divine Truth to Divine Good, since 'the ark' means heaven where the Lord is, see below in 9496. The reason why the rings were four was that this number means a joining together, 1686, 8877, and the reason why they were made of gold was that 'gold' means good, 113, 1551, 1552, 5658, 6914, good being what truth is joined to, since the good is so to speak the soil and the truth so to speak the seed.