Reverb Ventures (Reverb VC) is a small venture capital investment firm. Reverb, or reverberation, is defined as "prolongation of a sound; resonance, a continuing effect" which I think applies to new technologies and ideas, as they propagate through the world. I'd like the logo to reflect this process of sound (or water) waves moving and reverberating.
This isn't just a symbol. There's a whole logotype. The font itself is created from the "R" inscribed in the water waves.
In this way you can use the symbol alone, or just the name "REVERB". Both are unique and recognizable.