Ключевые слова: 21 may, 21 may icon, business, calendar 21, celebration, date, day, deadline, diary, element, flat, graphic, greeting, happy, holiday, icon, important, isolated, may 21, meeting, message, modern, month, new, note, notice, number, office, organizer, page, paper, plan, planner, reminder, sign, simple, single, symbol, time, today, tomorrow, web,