So I have had quite a few people ask me a great but simple question: should I be calling them scissors or shears?
Answer: Most simply, scissors are shorter than six inches and shears are longer than six inches. In addition, shears usually have double-ground edges and the finger holes are traditionally asymmetrical or different sizes. For the most part, what we end up using on a daily basis would be scissors technically. But, even the Milady's Professional Barbering textbook calls them shears.