GaoIt really takes someone unfamiliar with the City to find the name "Fingers" non-threatening. Roland is ready to admit that it might sound pretty mundane if you're not already familiar with the Syndicates, but still. It's easy, blatant symbolism that everyone reads loud and clear. "We hold the Backstreets in our hands." Or, possibly more relevant to the current situation, given the conflict, "if we close around you, you'll get crushed in our fist".