Ключевые слова: abc, abstract, algebra, alphabet, arithmetic, art, background, black, book, button, calculate, calculator, calculus, collection, concept, count, counter, creative, decor, decoration, decorative, design, education, font, icon, illustration, inscription, isolated, label, learn, math, mathematic, mathematical, mathematician, modern, number, pattern, preschool, print, school, script, set, sign, symbol, template, type, typeset, white, zero,