What a jalapeño has that a habanero lacks

I believe the answer is:

tilde

(Other definitions for tilde that I've seen before include "Augmentation of text" , "Accent on some Spanish words" , "Mark over the letter 'n' in Spanish" , "Significant mark" , "Accent (used over n) in Spanish and Portuguese" .)

I've seen this clue in The New York Times.

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