In the UK, Black Friday has been adopted by few retailers, bar Amazon. The online retailer has been offering discounts on more than 1,000 products from 21 November to 25 November in its Black Friday deals week. Black Friday is the traditional start to the Christmas shopping season in the US. It falls the day after the country's Thanksgiving celebration and has become a discount shopping day when millions of US shoppers are lured by massive savings. This year it falls on Friday 25 November and some stores in the US are even opening at 4am to tempt bargain hunters. Some claim the term Black Friday was coined to illustrate the point at which shops and stores start to make a profit, or go "into the black". Others believe it was first coined by the Philadelphia police department, which had become fed up with shoppers causing crowded pavements and traffic jams on the Friday after Thanksgiving.