This is a rebus puzzle consisting of four characters. The puzzle is very simple if you're knowledgeable enough.
Given four characters, guess two words:
ΔΕὖ%
The first word consists of 5 basic Latin letters and the second word consists of 7 basic Latin letters.
So what is the answer?
Hint
$$\frac{Δ} {5} \ \frac{Εὖ} {4} \frac{\%} {3}$$
Final Hint
The previous hint describes how many letters each group of characters is mapped to, and you only need to figure out one word, because the first word is already given away by the first character.