Ключевые слова: alimentary, anatomical, anatomy, background, biology, black, canal, cavity, design, digestive, element, esophagus, filled, flat, glyph, graphics, health, healthcare, human, icon, illustration, internal, isolated, logo, medical, medicine, oral, organ, outline, perfect, pharynx, pictogram, pixel, research, science, section, sign, stomach, structure, symbol, symptom, system, thin, throat, upper, web,