In fact, every entity sequence (&...;) in HTML encodes a character from Unicode (one or more codepoints). So, for example,   refers to the Unicode characte

In fact, every entity sequence (&...;) in HTML encodes a character from Unicode (one or more codepoints). So, for example,   refers to the Unicode character U+00A0 NO-BREAK SPACE. (Note that the bytes C2 A0 are simply the UTF-8 encoding of this character).