An HTML or XML numeric character reference refers to a character by its Universal Character Set/Unicode code point, and uses the format
&#nnnn;
or Xem thêm

Unicode adds a block property to UCS that further divides each plane into separate blocks. Each block is a grouping of characters by their use such as "mathematical operators" or "Hebrew script characters". When assigning characters to … Xem thêm

Unicode codifies over a hundred thousand characters. Most of those represent graphemes for processing as linear text. Some, however, either do not represent graphemes, or, as graphemes, require exceptional treatment. Unlike the ASCII control characters … Xem thêm

Unicode provides a list of characters it deems whitespace characters for interoperability support. Software Implementations and other standards may use the term to denote a slightly different set of characters. For example, Java does not consider … Xem thêm

Unicode and ISO divide the set of code points into 17 planes, each capable of containing 65536 distinct characters or 1,114,112 total. As of 2022 (Unicode 15.0) ISO and the Unicode Consortium has only allocated characters and blocks in seven of the 17 planes. … Xem thêm

Unicode assigns to every UCS character a general category and subcategory. The general categories are: letter, mark, number, punctuation, symbol, or control (in other words a formatting or non-graphical character).
Types include: Xem thêm

The term "character" is not well defined, and what we are referring to most of the time is the grapheme. A grapheme is represented visually by its glyph. The typeface (often … Xem thêm