Repurposing common words to have technical meanings is a basic trope in mathematics: kernel, neuron, limit, derivative, spectrum, manifold, atlas, chart, model, group, ring, ideal, field, topology, open, closed, compact, exotic, neighborhood, domain, immerse, embed, fibre, bundle, flow, section, measure, category, scheme, torsion, ...

... and typing Natural Transformation into google shows you skinny dudes that got buff.