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How well do you know the letter D?

Guess the real numbers behind the letter D, see how everyone else guessed, and get the source.

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What number does the Roman numeral D represent?

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Today's round

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  • 1 opinion poll
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Guess, see the crowd, get the real number. One ranked attempt per day.

D by the numbers

Real figures with their sources. All D facts →

over 1 billion

About how many people worldwide can be considered vitamin D deficient?

More than one billion people worldwide — across all ages — can be considered vitamin D deficient, according to health researchers.

Source: Wikipedia (Vitamin D) (2023) en.wikipedia.org

1922

In what year was vitamin D discovered and named?

Vitamin D was discovered and named in 1922 during research into rickets, becoming the fourth vitamin to be identified.

Source: Wikipedia (Vitamin D) (2023) en.wikipedia.org

1939

In what year was the Rh D blood antigen discovered?

Karl Landsteiner and Alexander Wiener discovered the Rh D antigen in 1939, a find whose medical significance became clear the following year.

Source: Wikipedia (Rh blood group system) (2022) en.wikipedia.org

What people think about the letter D

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If you had to get a grade, which would you rather have?

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Which 'D' word do you associate with most?

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Favorite word that starts with D?

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Questions

How does DSurvey.com work?

Each question asks you to guess a real number about the letter D. After you answer you see how everyone else guessed, then the real figure and where it comes from.

How is the daily round scored?

Four stats and one opinion poll. A correct guess earns 100 points plus up to 50 for speed, with a combo bonus for answers in a row. The range next to the right answer earns 40. Opinion polls earn 25 for having your say, and nailing every stat adds 150.

Where do the numbers come from?

Every stat links to its source, such as government statistics agencies, research organizations and industry groups. Figures are checked against the source before they go live.

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