I was following a tutorial for datamining from [here](http://www.smashingmagazine.com/2015/04/web-scraping-with-nodejs/).

I noticed that the variable **$** was declared. What was the reason for a variable name like this?

```
var request = require("request"),
    cheerio = require("cheerio"),
    url = "http://www.wunderground.com/cgi-bin/findweather/getForecast?&query=" + 02888;

request(url, function (error, response, body) {
    if (!error) {
        var $ = cheerio.load(body),
            temperature = $("[data-variable='temperature'] .wx-value").html();

        console.log("It’s " + temperature + " degrees Fahrenheit.");
    } else {
        console.log("We’ve encountered an error: " + error);
    }
});

```