I’m not a designer, but here is my thought process. The main building block of MW / Grin is ECC (Elliptic Curve Cryptography), G in Grin could be secp256k1 base point G. Unfortunately it’s not very distinguishable from regular G. But what if we take some elliptic curve (over the real numbers of course) as a symbol? Like this one (in blue) - reminds me G.
