The Tripadvisor website uses a star rating system to rate hotels, attractions and restaurants. The number of $$ next to a business on Tripadvisor indicates the average price for a meal or overnight stay at that establishment.
The number of $ signs is based on the prices submitted by users who have visited the business. Users can submit their own prices for establishments they have visited, and these prices are used to generate the $$ figure displayed next to each business listing.
The purpose of the $$ symbol is to give travelers an idea of how much they can expect to spend at a particular restaurant, hotel or attraction. It's important to keep in mind that the prices submitted by users are only averages, so actual costs may be higher or lower than what is indicated next to a business on Tripadvisor.