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uþb is a three-character sequence consisting of the Latin letter u, the Icelandic letter thorn (þ), and the Latin letter b. It is not a widely recognized term or concept in major reference works, and it does not denote a specific entity or idea on its own. The inclusion of the thorn character makes it more notable in discussions of orthography, encoding, and text processing than as a semantic word.

In linguistic and orthographic contexts, þ was historically used in Old English and is still used in Icelandic. The sequence uþb does not function as a word in Icelandic or English; it is more likely to appear as a typographic artifact, a fragment within a longer term containing thorn, or as an example in illustrations of non-ASCII characters.

In computing and encoding discussions, uþb can serve as a concrete example of how non-ASCII characters are represented digitally. In Unicode, the thorn character is U+00FE. The string "uþb" encoded in UTF-8 consists of the bytes: 75 C3 BE 62, reflecting the UTF-8 representation of 'u' (U+0075), 'þ' (U+00FE), and 'b' (U+0062). This makes it a useful minimal snippet for demonstrating encoding practices, normalization issues, or mojibake scenarios when characters are misinterpreted.

There are no major standards, organizations, or theories specifically tied to the exact string "uþb." It may appear as a user name, a placeholder in data samples, or a teaching example in discussions of Unicode, typography, or Icelandic orthography.

See also: thorn (letter), Unicode, UTF-8, mojibake, Icelandic orthography.