Restaurant ratings identify restaurants according to their quality, using notations such as stars or other symbols, or numbers. Stars are a familiar and popular symbol, with ratings of one to four or five stars commonly used. Ratings appear in guide books as well as in the media, typically in newspapers, lifestyle magazines and webzines. Websites featuring consumer-written reviews and ratings are increasingly popular, but are far less reliable. In addition, there are ratings given by public health agencies rating the level of sanitation practiced by an establishment.