#letter_of_the_alphabet__letter__alphabetic_character  the conventional characters of the alphabet used to represent speech; "his grandmother taught him his letters"
  supertype:  #grapheme__character__graphic_symbol__graphicsymbol  a written symbol that is used to represent speech; "the Greek alphabet has 24 characters"
  part of:  #spelling
  member of:  #alphabet
  subtype:  #ascender.letter_of_the_alphabet  a lowercase letter that has a part extending above other lowercase letters
  subtype:  #descender.letter_of_the_alphabet  a lowercase letter that has a part extending below other lowercase letters
  subtype:  #digraph  two successive letters (especially two letters used to represent a single sound: `sh' in `shoe')
  subtype:  #initial  the first letter of a word (especially a person's name); "he refused to put the initials FRS after his name"
  subtype:  #A  the 1st letter of the Roman alphabet
  subtype:  #B  the 2nd letter of the Roman alphabet
  subtype:  #c__C  the 3rd letter of the Roman alphabet
  subtype:  #D  the 4th letter of the Roman alphabet
  subtype:  #E  the 5th letter of the Roman alphabet
  subtype:  #F  the 6th letter of the Roman alphabet
  subtype:  #G  the 7th letter of the Roman alphabet
  subtype:  #H  the 8th letter of the Roman alphabet
  subtype:  #i__I  the 9th letter of the Roman alphabet
  subtype:  #J  the 10th letter of the Roman alphabet
  subtype:  #K  the 11th letter of the Roman alphabet
  subtype:  #L  the 12th letter of the Roman alphabet
  subtype:  #M  the 13th letter of the Roman alphabet
  subtype:  #n  the 14th letter of the Roman alphabet
  subtype:  #O  the 15th letter of the Roman alphabet
  subtype:  #P  the 16th letter of the Roman alphabet
  subtype:  #Q  the 17th letter of the Roman alphabet
  subtype:  #R  the 18th letter of the Roman alphabet
  subtype:  #S__s__  the 19th letter of the Roman alphabet
  subtype:  #T  the 20th letter of the Roman alphabet
  subtype:  #U  the 21st letter of the Roman alphabet
  subtype:  #V  the 22nd letter of the Roman alphabet
  subtype:  #W  the 23rd letter of the Roman alphabet
  subtype:  #X  the 24th letter of the Roman alphabet
  subtype:  #Y  the 25th letter of the Roman alphabet
  subtype:  #z__Z__zee__zed  the 26th letter of the Roman alphabet; "the British call Z zed but Americans call it zee"
  subtype:  #alpha  the 1st letter of the Greek alphabet
  subtype:  #beta  the 2nd letter of the Greek alphabet
  subtype:  #gamma  the 3rd letter of the Greek alphabet
  subtype:  #delta.letter_of_the_alphabet  the 4th letter of the Greek alphabet
  subtype:  #epsilon  the 5th letter of the Greek alphabet
  subtype:  #zeta  the 6th letter of the Greek alphabet
  subtype:  #eta  the 7th letter of the Greek alphabet
  subtype:  #theta  the 8th letter of the Greek alphabet
  subtype:  #iota  the 9th letter of the Greek alphabet
  subtype:  #kappa  the 10th letter of the Greek alphabet
  subtype:  #lambda.letter_of_the_alphabet  the 11th letter of the Greek alphabet
  subtype:  #mu  the 12th letter of the Greek alphabet
  subtype:  #nu  the 13th letter of the Greek alphabet
  subtype:  #xi  the 14th letter of the Greek alphabet
  subtype:  #omicron  the 15th letter of the Greek alphabet
  subtype:  #pi  the 16th letter of the Greek alphabet
  subtype:  #rho  the 17th letter of the Greek alphabet
  subtype:  #sigma  the 18th letter of the Greek alphabet
  subtype:  #tau  the 19th letter of the Greek alphabet
  subtype:  #upsilon  the 20th letter of the Greek alphabet
  subtype:  #phi  the 21st letter of the Greek alphabet
  subtype:  #chi  the 22nd letter of the Greek alphabet
  subtype:  #psi  the 23rd letter of the Greek alphabet
  subtype:  #omega  the last (24th) letter of the Greek alphabet
  subtype:  #aleph  the 1st letter of the Hebrew alphabet
  subtype:  #beth  the 2nd letter of the Hebrew alphabet
  subtype:  #gimel  the 3rd letter of the Hebrew alphabet
  subtype:  #daleth  the 4th letter of the Hebrew alphabet
  subtype:  #he  the 5th letter of the Hebrew alphabet
  subtype:  #waw  the 6th letter of the Hebrew alphabet
  subtype:  #zayin  the 7th letter of the Hebrew alphabet
  subtype:  #heth  the 8th letter of the Hebrew alphabet
  subtype:  #teth  the 9th letter of the Hebrew alphabet
  subtype:  #yodh  the 10th letter of the Hebrew alphabet
  subtype:  #kaph  the 11th letter of the Hebrew alphabet
  subtype:  #lamedh  the 12th letter of the Hebrew alphabet
  subtype:  #mem  the 13th letter of the Hebrew alphabet
  subtype:  #nun.letter_of_the_alphabet  the 14th letter of the Hebrew alphabet
  subtype:  #samekh  the 15th letter of the Hebrew alphabet
  subtype:  #ayin  the 16th letter of the Hebrew alphabet
  subtype:  #pe  the 17th letter of the Hebrew alphabet
  subtype:  #sadhe  the 18th letter of the Hebrew alphabet
  subtype:  #qoph  the 19th letter of the Hebrew alphabet
  subtype:  #resh  the 20th letter of the Hebrew alphabet
  subtype:  #sin  the 21st letter of the Hebrew alphabet
  subtype:  #shin.letter_of_the_alphabet  the 22nd letter of the Hebrew alphabet
  subtype:  #taw  the 23rd letter of the Hebrew alphabet
  subtype:  #polyphone__polyphonicletter  a letter that has two or more pronunciations; "`c' is a polyphone because it is pronounced like `k' in `car' but like `s' in `cell'"
  subtype:  #block_letter__blockletter__block_capital__blockcapital  a plain hand-drawn letter
  subtype:  #vowel  a letter of the alphabet standing for a spoken vowel
     subtype:  #vowel_point__vowelpoint  a mark placed below or near a consonant (as in Hebrew or Arabic) to indicate the spoken vowel
  subtype:  #consonant.letter_of_the_alphabet  a letter of the alphabet standing for a spoken consonant

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