Root is sometimes shown as a period (.), although the actual symbol for root is a null character. Beneath root is a group of domains known as top level domains (TLDs). Figure 11.4 shows some of the TLDs for the world's most famous DNS namespace: the Internet. Top level domains include the familiar .com, .org, and .edu domains, as well as domains for national governments, such as .us (United States), .uk (United Kingdom), .fr (France), and .jp (Japan).