Definition: The word "pt_utf8" is a standard for encoding in the UTF-8 character set, which is used by various applications such as web browsing and operating systems like Windows. The definition of "pt_utf8" is that it refers to the internationalization of the UTF-8 character set (UTF 16) within the European Union and is not a standard in its own right. It's typically utilized for encoding purposes due to its universal compatibility with other languages.