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An example of a full wallpaper name in Hermann-Mauguin style (also called IUCr notation) is p31m, with four letters or digits; more usual is a shortened name like cmm or pg. For wallpaper groups the full notation begins with either p or c, for a primitive cell or a face-centred cell; these are explained below.
This list of all two-letter combinations includes 1352 (2 × 26 2) of the possible 2704 (52 2) combinations of upper and lower case from the modern core Latin alphabet.A two-letter combination in bold means that the link links straight to a Wikipedia article (not a disambiguation page).
The grapheme ß was originally made out of the characters long s (ſ) and z, the latter of which evolved into s. In Germany, the grapheme is still used today. Throughout history, various names have been spelled with ß. Many of the spelling variations are hypercorrected variants of other spellings of the name.
These Latin-script alphabets may discard letters, like the Rotokas alphabet, or add new letters, like the Danish and Norwegian alphabets. Letter shapes have evolved over the centuries, including the development in Medieval Latin of lower-case , forms which did not exist in the Classical period alphabet.
The letters A, E, I, O, and U are considered vowel letters, since (except when silent) they represent vowels, although I and U represent consonants in words such as "onion" and "quail" respectively. The letter Y sometimes represents a consonant (as in "young") and sometimes a vowel (as in "myth").
In writing and typography, a ligature occurs where two or more graphemes or letters are joined to form a single glyph.Examples are the characters æ and œ used in English and French, in which the letters a and e are joined for the first ligature and the letters o and e are joined for the second ligature.
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The 17 wallpaper groups, with finite fundamental domains, are given by International notation, orbifold notation, and Coxeter notation, classified by the 5 Bravais lattices in the plane: square, oblique (parallelogrammatic), hexagonal (equilateral triangular), rectangular (centered rhombic), and rhombic (centered rectangular).