{version} wildcard in MVC4 Bundle

In MVC 4 we have bundles. While defining the bundles we can use wildcards like * for all files in a folder.

In the example below what does -{version} mean?

public static void RegisterBundles(BundleCollection bundles)
{
    bundles.Add(new ScriptBundle("~/bundles/jquery").Include(
        "~/Scripts/jquery-{version}.js"));
}