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A numeric character reference refers to a character by its Universal Character Set/Unicode code point, and a character entity reference refers to a character by a predefined name. A numeric character reference uses the format &#nnnn; or &#xhhhh; where nnnn is the code point in decimal form, and hhhh is the code point in hexadecimal form.
This table lists all two-letter codes (set 1), one per language for ISO 639 macrolanguage, and some of the three-letter codes of the other sets, formerly parts 2 and 3. Entries in the Scope column distinguish: Individual language; Collections of related languages; Macrolanguages; The Type column distinguishes: Ancient languages (extinct since ...
It includes Ñ for Spanish, Asturian and Galician, the acute accent, the diaeresis, the inverted question and exclamation marks (¿, ¡), the superscripted o and a (º, ª) for writing abbreviated ordinal numbers in masculine and feminine in Spanish and Galician, and finally, some characters required only for typing Catalan and Occitan, namely ...
Where two ISO 639-2 codes are given in the table, the one with the asterisk is the bibliographic code (B code) and the other is the terminological code (T code). Entries in the Scope column distinguish: individual language; collections of languages connected, for example genetically or by region; macrolanguages. The Type column distinguishes:
This did not work for characters not in the Windows Code Page (such as box-drawing characters). The new Alt+0### combination (which prefixes a zero to each Alt code), produces characters from the newer "Windows code pages." [a] For example, Alt+ 0 1 6 3 yields the character £ (symbol for the pound sterling) which is at 163 in CP1252. [2] [b]
The intended use [2] when these characters were added to Unicode was to produce true superscripts and subscripts so that chemical and algebraic formulas could be written without markup. Thus "H₂O" (using a subscript 2 character) is supposed to be identical to "H 2 O" (with subscript markup).
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The accent mark in Spanish has an important function: it marks the stressed or "accented" syllable in a word. It is also used to distinguish homonyns, such as Spanish: si (if) and Spanish: sí (yes). The use of accent marks in Spanish, except for capital letters, is not optional. They follow rules.