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2. List of Unicode characters - Wikipedia

   en.wikipedia.org/wiki/List_of_Unicode_characters

   A numeric character reference refers to a character by its Universal Character Set/Unicode code point, and a character entity reference refers to a character by a predefined name. A numeric character reference uses the format &#nnnn; or &#xhhhh; where nnnn is the code point in decimal form, and hhhh is the code point in hexadecimal form.

3. List of file signatures - Wikipedia

   en.wikipedia.org/wiki/List_of_file_signatures

   List of file signatures. This is a dynamic list and may never be able to satisfy particular standards for completeness. You can help by adding missing items with reliable sources. This is a list of file signatures, data used to identify or verify the content of a file. Such signatures are also known as magic numbers or Magic Bytes.

4. ISO 3166-1 alpha-2 - Wikipedia

   en.wikipedia.org/wiki/ISO_3166-1_alpha-2

   ISO 3166-1 alpha-2 codes are two-letter country codes defined in ISO 3166-1, part of the ISO 3166 standard [1] published by the International Organization for Standardization (ISO), to represent countries, dependent territories, and special areas of geographical interest. They are the most widely used of the country codes published by ISO (the ...

5. List of freedom indices - Wikipedia

   en.wikipedia.org/wiki/List_of_freedom_indices

   This article is a list of freedom indices produced by several non-governmental organizations that publish and maintain assessments of the state of freedom in the world, according to their own various definitions of the term, and rank countries as being free, partly free, or using various measures of freedom, including civil liberties, political rights and economic rights.

6. List of TCP and UDP port numbers - Wikipedia

   en.wikipedia.org/wiki/List_of_TCP_and_UDP_port...

   This is a list of TCP and UDP port numbers used by protocols for operation of network applications. The Transmission Control Protocol (TCP) and the User Datagram Protocol (UDP) only need one port for duplex, bidirectional traffic. They usually use port numbers that match the services of the corresponding TCP or UDP implementation, if they exist.

7. List of Internet top-level domains - Wikipedia

   en.wikipedia.org/wiki/List_of_Internet_top-level...

   Appearance. This list of Internet top-level domains (TLD) contains top-level domains, which are those domains in the DNS root zone of the Domain Name System of the Internet. A list of the top-level domains by the Internet Assigned Numbers Authority (IANA) is maintained at the Root Zone Database. [ 1 ] IANA also oversees the approval process for ...