With 16-bits allowing for 2 16 = 65,536 code points, the 7,129 characters of Unicode 1.0 fit easily, but by the time Unicode 3.1 rolled around in 2001, Unicode contained no less than 94,140 ...

In Unicode, certain characters, symbols, emojis, etc. are assigned numbers called 'code points.' Code points are written in the format 'U+XXXX,' where the 'U+' indicates that it is Unicode ...

the private use part is also often used in icon fonts. There are specific Unicode encodings such as 'UTF-8', 'UTF-16', and 'UTF-32'. UTF-32 is the simplest encoding that simply stores code points ...

These are characters which can be built from multiple glyphs, but they also have a pre-built Unicode point. There are also ligatures that combine multiple characters into a single code point.