Level is a palindrome that is a synonym for horizontal
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A palindrome is a word, phrase, number, or other sequence of characters that reads the same forward and backward. For "uniform," a palindrome could be "namrofinu." For "horizontal," a palindrome could be "latsiroloh." These palindromes retain the original spelling when read in reverse order.
Rotor blades
It is simply a plane surface making an angle with the horizontal (ground).
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