Unlucky Numbers Around the World

An unlucky number is a number that some people or institutions avoid because of a cultural, linguistic, historical, religious, or folk association. The association can affect a date, floor, room, gift, address, phone number, or other identifier without being shared by everyone in that culture.

The number 4 is associated with death in some Chinese-, Japanese-, and Korean-language contexts, while 13 is widely treated as unlucky in many Western contexts and 17 has a particularly strong association in Italian popular tradition. These examples show why a number's meaning cannot be separated from language, history, and place.

NumberOrigin distinguishes a documented taboo from a claim that a number causes misfortune. The table below records scoped associations and their reported mechanisms; it does not predict outcomes or assign a universal danger score.

Why number taboos differ

Number taboos often begin with a sound resemblance, a written form, a historical story, or a religious and social convention. Once an association becomes familiar, it may appear in design choices, gift customs, dates, buildings, or commercial identifiers. That visible behavior documents a tradition; it does not prove a supernatural effect.

Why is 4 avoided in some East Asian contexts?

In some Chinese-language contexts, a pronunciation of 4 resembles a word associated with death. Japanese and Korean contexts also have readings that connect 4 with death, though the language, institution, and strength of avoidance differ. These should be described as related but distinct traditions rather than one shared East Asian rule.

Why is 9 avoided in Japan?

One Japanese reading of 9 resembles a word associated with suffering. That association can make 9 unwelcome in particular settings, alongside 4, but it does not make the digit universally unlucky in every Japanese context.

Why is 13 considered unlucky in Western contexts?

13 has a long-standing bad-luck association in several Western settings and is especially visible in Friday the 13th. Explanations often connect the number with religious or historical stories, but no single origin account explains every modern use of the superstition.

Why is 17 avoided in Italy?

In Italian popular tradition, Friday the 17th can be treated as an unlucky date. Explanations commonly refer to the Roman-numeral form XVII and the Latin phrase VIXI, but the historical development of that explanation is not completely settled. A responsible account should preserve that uncertainty.

A number can be unlucky in one place and ordinary elsewhere

These traditions are not interchangeable with NumberOrigin's Western numerology digit guides. Western numerology reduces numbers within a symbolic calculation method; cultural number taboos describe associations that arise in particular languages, communities, and practices. The same digit can therefore have different roles in the two systems.

For a broader comparison of favored, avoided, and significant number traditions, visit Lucky Numbers Around the World. For a detailed example of Chinese-language associations, read the guide to Chinese Lucky Numbers.

How to read the evidence

A language-based explanation is different from a documented custom, and both are different from economic evidence that people pay more for a preferred identifier or avoid a number in a building. NumberOrigin labels these distinctions so that a familiar folk explanation is not presented as a universal cultural fact.

Cultural practices also change. Region, dialect, religion, generation, institution, and personal belief can all affect whether a number is avoided. The entries on this page should be read as scoped reference points, not as statements about every member of a national or religious group.