Characters Type

According to the Unicode standard, which tends to standardize the character encoding, there are 6 classes of characters/type of characters:

'Letters' which may be uppercase, lowercase, or neither (non-Latin alphabets)

Example: ABCdefğhï (Accented letters are composed of a letter and a mark but are considered as a single letter in practice)

'Digits' including Arabic numerals, but there are also the Roman numerals, and others

Example: 0123

'Symbols' which include mathematical symbols, currency symbols, etc.

Example: +€$

'Punctuation', dots, commas, dashes, and so on.

Example: ?;!,.

'The separators' which are spaces, line breaks, and so on.

'Marks' which are character modifiers (accents, diacritics, etc.)

'Other', invisible characters, control characters, etc.

Unicode standardizes the computer encoding of texts in all languages at the international level. For the purpose of standardization, any character must be part of one of these 6 classes.