The more we reflect upon this question, the harder it is to
2 answers:
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Answer:
Those are Moon Letters
Explanation:
Moon-letters were special Dwarven runes written in ithildin that could only be revealed by the Moon at a certain time.[1] They are only mentioned in The Hobbit when Elrond held up Thror's Map to read to Thorin and Company.
(translation image below)
