A store window sign typically consists of two words: 'SALE' and 'OPEN'. The word 'SALE' is used to indicate that the store is offering discounts or promotions on certain items. The word 'OPEN' is used to indicate that the store is OPEN for business. Both words are usually printed in large, bold letters so that they can be easily seen from a distance. Store window signs are an important part of marketing and advertising for businesses, as they help to attract customers and increase sales.