Rules:
1.) Δ1 = w
2.) Δ2 = e0
3.) Δ3 = z0
4.) Δ4 = n0
5.) Δn = the nth symbol
6.) Δ(Δ1) = Δw
7.) Δ(Δ2) = Δe0
8.) Δ(Δ3) = Δz0
9.) Δ(Δ4) = Δn0
10.) Δ(Δ(1)) = Δ(Δw)
11.) Δ(Δ(2)) = Δ(Δe0)
12.) Δ(Δ(Δ(1))) = Δ(Δ(Δw))
13.) Pattern repeats
14.) ΔΔn = Δ(Δ(Δ(Δ(Δ(......Δ(Δ(Δ(1)))...))) with n triangles
15.) There's always going to be an assumed one after the triangles
16.) ΔΔw = Δ(Δ(Δ......Δ(Δ(1)))...))) with w Δ's. Also, ΔΔw+1 = Δ(Δ(Δ(Δ(Δ....Δ(Δ(Δ(1)) with w+1 Δ's.
17.) ΔΔ(Δ1) = ΔΔw
18.) ΔΔ(Δ2) = ΔΔe0
19.) Pattern Repeats
20.) ΔΔΔn = ΔΔ(ΔΔ(ΔΔ(ΔΔ.....ΔΔ(ΔΔ(ΔΔ(ΔΔ(ΔΔ1))))...))) with n ΔΔ's.
21.) ΔΔΔΔn = ΔΔΔ(ΔΔΔ(ΔΔΔ......ΔΔΔ(ΔΔΔ1)))...)))) with n ΔΔΔ's.
22.) Pattern repeats
23.) Δ_1 = Δ1
24.) Δ_2 = ΔΔ1
25.) Δ_3 = ΔΔΔ1
26.) Pattern repeats
27.) ΔΔ_1,n = Δ_(Δ_(Δ_....Δ_(Δ_1))))....)))) with n Δ_'s.
28.) ΔΔΔ_1,n = ΔΔ_(ΔΔ_(ΔΔ_....ΔΔ_(ΔΔ_1)))..))) with n ΔΔ_'s.
29.) Pattern repeats.
30.) Δ__1 = Δ_1,n.
31.) Δ__2 = ΔΔ_1,n
32.) Δ__3 = ΔΔΔ_1,n
33.) Pattern repeats.
34.) ΔΔ__1,n = Δ__(Δ__(Δ__(Δ__(....Δ__(Δ__1))))...)))))) with n Δ's.
35.) Pattern repeats
36.) Δ___1 = Δ__1,n
37.) Δ___2 = ΔΔ__2,n
38.) ΔΔ___1,n = Δ___(Δ___(Δ___(Δ___....Δ___(Δ___1)))...)))) with n Δ___'s.
39.) Pattern repeats with 4 _'s, 5 _'s, etc.
40.) FINAL RULE (unless I make an extended version :p); yΔ--x--1,n = ΔΔΔΔ....ΔΔΔΔ____....___1,n with y triangles and x underscores.