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x is just an arbitrary place holder. You could call it peach if you wanted. It basically acts a placeholder for the .each method.
N, or n, is the fourteenth letter of the Latin alphabet, used in the modern English alphabet, the alphabets of other western European languages, ...

N

N, or n, is the fourteenth letter of the Latin alphabet, used in the modern English alphabet, the alphabets of other western European languages, and others worldwide. Its name in English is en, plural ens. Wikipedia
Alphabetical position: 14
Descendants: • ₦; • Ƞ; • Ŋ; • ɧ; • ʩ
Language of origin: Latin language
Other letters commonly used with: n(x), nh, ng, ny
Phonetic usage: /ɛn/
Sisters: Н; Ң; Ӊ; Ӈ; Ԋ; נ; ן; ن; ܢ; ނ; Ն ն; Մ մ; ࠍ; ነ; ᚾ; Ꮋ; Ꮑ; Ꮓ
Writing direction: Left-to-Right

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(stenoscript) Abbreviation of no, inflections none, nor, not, neither, and homophone know.