What's an Acroterion?

Acroterion, in classical architecture: decorative pedestal for a statue placed at the gable end, or pediment at the peak of Greek temples. (M.S. Briggs, Concise Encyclopedia of Architecture)
Acroterium, Originally an ornament on the roof corners of Greek templates. In classical furniture, similar ornaments applied to the top corners of secretaries, bookcases, highboys, and other important furniture.

Why did we choose a difficult word for a Search Engines Optimization Firm?

In interent marketing it's not an easy task to reach the peak, the acro. It takes a lot of work to push your results to the top - a lot of work from skilled and dedicated people. And that's what we like to do.