I noticed how Nazgûl always has a circumflex (“^”) over the u. Does that mean anything about how I pronounce the word? Or is it just decoration?
Or, in other words:
What does the circumflex mean in Tolkien’s languages?
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From Appendix E, "Writing and Spelling":
In Sindarin long vowels in stressed monosyllables are marked with the circumflex, since they tended in such cases to be specially prolonged; so in dûn compared with Dúnadan. The use of the circumflex in other languages such as Adûnaic or Dwarvish has no special significance, and is used merely to mark these out as alien tongues (as with the use of k).
Presumably Black Speech is included in the "other languages" here.