I don't know whether they are letters that are lucky, but the letters S, N, L, R, & T are the most commonly used consonant letters in the English Language. I guess they could be lucky letters when playing Wheel of Fortune as they would likely be in the puzzle.
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The Alamo is a landmark that has five letters.
five sides, 10 letters= pentagonal
Holidays with five letters are Arbor Day or Labor Day.
Five
Five letter words that can be made from those letters are vodka and goads.