Literature Reference: 衍，水朝宗于海也。——《说文》；臻，至也。——《说文》 Yan refers to water flowing towards the sea, and Zhen means reaching or arriving. Source from 'Shuowen'.
衍: Extend, initiate, evolve.
臻: A realm of splendor.
Meaning: Like water flowing towards the sea, reaching the ultimate state of perfection.