Ключевые слова: abstract, atom, background, biology, check, checklist, chemical, connection, contour, design, dna, document, element, exam, form, glowing, graphic, icon, illustration, instrument, isolated, light, line, linear, list, mark, medical, medicine, model, molecular, molecule, neon, outline, paper, plus, protractor, questionnaire, research, scale, school, science, set, shape, sign, structure, symbol, technology,