Latin Extended-B
Latin Extended-B is the fourth block (0180-024F) of the Unicode Standard. It has been included since version 1.0, where it was only allocated to the code points 0180-01FF and contained 113 characters. During unification with ISO 10646 for version 1.1, the block range was extended by 80 code points and another 35 characters were assigned. In version 3.0 and later, the last 60 available code points in the block were assigned. Its block name in Unicode 1.0 was Extended Latin. Subheadings. The Latin Extended-B block contains ten subheadings for groups of characters: Non -European and historic Latin, African letters for clicks, Croatian digraphs matching Serbian Cyrillic letters, Pinyin diacritic-vowel combinations, Phonetic and historic letters, Additions for Slovenian and Croatian, Additions for Romanian, Miscellaneous additions, Additions for Livonian, and Additions for Sinology. The Non-European and historic, African clicks, Croatian digraphs, Pinyin, and the first part of the Phonetic and historic letters were present in Unicode 1.0; additional Phonetic and historic letters were added for version 3.0; and other Phonetic and historic, as well as the rest of the sub-blocks were the characters added for version 1.1. Non-European and historic Latin . The Non-European and historic Latin subheading contains the first 64 characters of the block, and includes various variant letters for use in Zhuang, Americanist phonetic transcription, African languages, and other Latin script alphabets. It does not contain any standard letters with diacritics. African letters for clicks. The four African letters for clicks are used in Khoisan orthography. Croatian digraphs matching Serbian Cyrillic letters. The Croatian digraphs matching Serbian Cyrillic letters are three sets of three case mappings (lower case, upper case, and title case) of Latin digraphs used for compatibility with Cyrillic texts, Serbo-Croatian being a digraphic language . Pinyin diacritic-vowel combinations. The 16 Pinyin diacritic-vowel combinations are used to represent the standard Mandarin Chinese vowel sounds with tone marks. Phonetic and historic letters. The 35 Phonetic and historic letters are largely various standard and variant Latin letters with diacritic marks. Additions for Slovenian and Croatian. The 24 Additions for Slovenian and Croatian are all standard Latin letters with unusual diacritics, like the double grave and inverted breve. Additions for Romanian. The Additions for Romanian are 4 characters that were erroneously unified as having a cedilla, when they have a comma below. The conflation of S and  T with cedilla vs. comma below continues to plague Romanian language implementation up to the present. Miscellaneous additions. The Miscellaneous additions subheading contains 39 characters of various description and origin. Additions for Livonian. The Additions for Livonian are 10 letters with diacritics for writing the Livonian language. Additions for Sinology. The Additions for Sinology are three lowercase letters with curls used in the study of classical Chinese language. Additions for Africanist linguistics. The Additions for Africanist linguistics are two lowercase letter with swash tails used in Africanist linguistics. Additions for Sencoten. The Additions for Sencoten are 5 letters with strokes  for writing Saanich. Number of letters. The following table shows the number of letters in the Latin Extended-B block. History. The following Unicode-related documents record the purpose and process of defining specific characters in the Latin Extended-B block: