If you want to sound smart, you can refer to your finger, thumb, or toe as a digit. Each of the numbers from 0 to 9 is another kind of digit.

Although your pinkie toe may seem to be completely unrelated to the number three, each is a kind of digit. In fact, the practice of calling numbers digits comes from the digits on your hands — specifically, the habit of counting to ten on your fingers. The Latin root word digitus means "finger or toe," and English borrowed from this to mean "number."

Definitions of digit
  1. noun
    a finger or toe in human beings or corresponding body part in other vertebrates
    synonyms: dactyl
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    the fifth digit; the little finger or little toe
    any of the terminal members of the hand (sometimes excepting the thumb)
    one of the digits of the foot
    pollex, thumb
    the thick short innermost digit of the forelimb
    forefinger, index, index finger
    the finger next to the thumb
    annualry, ring finger
    the third finger (especially of the left hand)
    middle finger
    the second finger; between the index finger and the ring finger
    little finger, pinkie, pinky
    the finger farthest from the thumb
    big toe, great toe, hallux
    the first largest innermost toe
    a deformed toe which is bent in a clawlike arch
    little toe
    the fifth smallest outermost toe
    type of:
    appendage, extremity, member
    an external body part that projects from the body
  2. noun
    one of the elements that collectively form a system of numeration
    “0 and 1 are digits
    synonyms: figure
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    binary digit
    either 0 or 1 in binary notation
    octal digit
    a digit from 0 to 7 in octal notation
    decimal digit
    a digit from 0 to 9 in decimal notation
    duodecimal digit
    a digit from 0 to 11 in duodecimal notation
    hexadecimal digit
    a digit from 0 to 15 in hexadecimal notation
    significant digit, significant figure
    any digit of a number that is known with certainty; any digit of a number beginning with the leftmost non-zero digit and ending with the rightmost non-zero digit (or a zero considered to be the exact value)
    0, cipher, cypher, nought, zero
    a mathematical element that when added to another number yields the same number
    1, I, ace, one, single, unity
    the smallest whole number or a numeral representing this number
    2, II, deuce, two
    the cardinal number that is the sum of one and one or a numeral representing this number
    3, III, deuce-ace, leash, tercet, ternary, ternion, terzetto, three, threesome, tierce, trey, triad, trine, trinity, trio, triplet, troika
    the cardinal number that is the sum of one and one and one
    4, IV, Little Joe, four, foursome, quadruplet, quartet, quatern, quaternary, quaternion, quaternity, tetrad
    the cardinal number that is the sum of three and one
    5, Little Phoebe, Phoebe, V, cinque, fin, five, fivesome, pentad, quint, quintet, quintuplet
    the cardinal number that is the sum of four and one
    6, Captain Hicks, VI, half a dozen, hexad, sestet, sextet, sextuplet, sise, six, sixer
    the cardinal number that is the sum of five and one
    7, VII, heptad, septenary, septet, seven, sevener
    the cardinal number that is the sum of six and one
    8, VIII, eight, eighter, eighter from Decatur, octad, octet, octonary, ogdoad
    the cardinal number that is the sum of seven and one
    9, IX, Nina from Carolina, ennead, nine, niner
    the cardinal number that is the sum of eight and one
    monad, monas
    a singular metaphysical entity from which material properties are said to derive
    a single object (as distinguished from a pair)
    craps, snake eyes
    expressions used when when two dice are thrown and both come up showing one spot
    brace, couple, couplet, distich, duad, duet, duo, dyad, pair, span, twain, twosome, yoke
    two items of the same kind
    type of:
    integer, whole number
    any of the natural numbers (positive or negative) or zero
  3. noun
    the length of breadth of a finger used as a linear measure
    synonyms: finger, finger's breadth, fingerbreadth
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    type of:
    linear measure, linear unit
    a unit of measurement of length
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