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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).
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).
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.
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A totem ambigram is an ambigram whose letters are stacked like a totem, most often offering a vertical axis mirror symmetry. This type helps when several letters fit together, but hardly the whole word. For example, in the Maria monogram , the letters M, A and I are individually symmetrical, and the pairing R/A is almost naturally mirroring ...
Z was given its Greek name, zeta. This scheme has continued to be used by most modern European languages that have adopted the Latin alphabet. For the Latin sounds represented by the various letters see Latin spelling and pronunciation; for the names of the letters in English see English alphabet.
Bliss, originally titled Bucolic Green Hills, is the default wallpaper of Microsoft's Windows XP operating system. It is a photograph of a green rolling hills and daytime sky with cirrus clouds.
The letter eth (Ð ð) was later devised as a modification of dee (D d), and finally yogh (Ȝ ȝ) was created by Norman scribes from the insular g in Old English and Irish, and used alongside their Carolingian g. The a-e ligature ash (Æ æ) was adopted as a letter in its own right, named after a futhorc rune æsc.