Every time you check the time, you’re reading a piece of history that stretches back more than a thousand years, through Baghdad, Córdoba, and the trading ports of medieval Italy. The digits 0 through 9 feel so neutral, so universal, that it’s easy to forget they were invented somewhere, by someone, and that they had to fight for their place on the page. This is the story of how they got here — and why, on the dial of an Al Awaal watch, you can still see one branch of that story written in its original form.
It starts in India, not Arabia
The numerals the world now calls “Arabic” did not originate in Arabia. Their earliest ancestors are the Brahmi numerals of ancient India, symbols used on inscriptions and in mathematical texts roughly two thousand years ago. Brahmi numerals themselves weren’t a positional system — they had separate signs for units, tens, and hundreds, more like Roman numerals in spirit. The breakthrough that changed everything came later, somewhere in India, when mathematicians settled on a small set of nine digit-shapes plus a symbol for nothingness, and let a digit’s position in a string determine its value.
That symbol for nothingness — shunya in Sanskrit, meaning “void” or “empty” — is arguably the single most important idea in the whole story. Older number systems struggled with recording “no quantity here” as a quantity in its own right. Indian mathematicians treated zero as a full member of the number system, something you could write, place, and calculate with. Combined with positional place-value, where “1” means something different in the ones column than in the tens column, this gave the system a power that Roman numerals, Greek letter-numerals, and Egyptian hieroglyphic numbers simply didn’t have.
Baghdad, al-Khwarizmi, and the House of Wisdom
By the early ninth century, this Indian number system had reached Baghdad, then the intellectual capital of the Abbasid Caliphate and home to the Bayt al-Hikma, the House of Wisdom, where scholars translated and built on Greek, Persian, and Indian learning. Around 825 CE, the Persian mathematician Muhammad ibn Musa al-Khwarizmi wrote a treatise on what was called “Hindu reckoning” (hisab al-hind), explaining how to calculate using these nine digits and zero. The original Arabic text is lost, but a twelfth-century Latin translation survives, and it’s one of the main channels through which the system entered European mathematics.
Al-Khwarizmi’s name deserves a moment of its own. Latinized as “Algoritmi,” it’s the direct root of our word algorithm. His other major work, the Kitab al-Jabr wa’l-Muqabala, gave us algebra, from al-jabr, roughly “reunion of broken parts” — the operation of moving a term across an equation. Few individuals have left two words this fundamental in mathematics, and both trace back to a scholar working with Indian numerals in ninth-century Baghdad.
From Baghdad, the system spread and was refined across the Islamic world — through Cairo, through the great centers of learning in North Africa, and into al-Andalus, Islamic Spain, where Córdoba had become one of the most sophisticated cities in Europe. It was in this long, gradual process of transmission and adaptation, over centuries and across an enormous geographic range, that the numerals began to diverge into two visually distinct families.
Two branches: Eastern and Western Arabic numerals
As the numeral system moved west across North Africa toward Spain, the glyph shapes drifted from the forms used further east in Baghdad, Persia, and the Levant. Scholars generally describe two branches:
- Eastern Arabic numerals (sometimes called Mashriqi or Hindi numerals): ٠ ١ ٢ ٣ ٤ ٥ ٦ ٧ ٨ ٩, still used today across much of the Arab world, from Egypt to the Gulf, alongside Arabic script.
- Western Arabic numerals, sometimes called ghubar (“dust”) numerals after the dust-boards early mathematicians used for calculation: a set of forms that developed in the Maghreb and al-Andalus, and which — after further evolution in medieval Europe — became the 0-9 shapes used almost everywhere in the world today, including on this page.
It’s a detail that surprises a lot of people: the numerals printed in European books and the numerals used across much of the Arab world both descend from the same Indian ancestor and the same Baghdad-era refinement, but they are not the same symbols. They’re siblings, not twins. If you’ve ever wondered why digits on Arabic-language documents or clock faces look unfamiliar, that’s the reason — you’re looking at the branch that stayed closer to its Eastern roots. We go into the individual shapes in our guide to Eastern Arabic numerals ٠–٩.
| Indian ancestor (Brahmi-derived) | Eastern Arabic | Western Arabic (modern) |
|---|---|---|
| One | ١ | 1 |
| Two | ٢ | 2 |
| Three | ٣ | 3 |
| Five | ٥ | 5 |
| Zero (“void”) | ٠ | 0 |
Fibonacci and the slow European adoption
The system’s most famous European champion was Leonardo of Pisa, better known as Fibonacci, who had grown up partly in North Africa, where his father worked at a trading post in Béjaïa (in modern Algeria). There he learned the Hindu-Arabic numeral system as used by Maghrebi merchants and mathematicians. In 1202 he published Liber Abaci (“Book of Calculation”), a text aimed squarely at merchants, showing how the nine digits and zero made bookkeeping, currency conversion, and interest calculations far faster than Roman numerals ever could.
Even so, adoption in Europe was slow and, at times, actively resisted. Professional abacists, who used counting boards and Roman numerals, had a stake in the old system, and there was real suspicion of the new digits, partly because a written “0” was easily altered into a “6” or “9,” making them seem ripe for fraud. Florence went as far as banning these numerals in account books in 1299, insisting merchants stick to Roman numerals or write amounts out in words. It’s a reminder that useful notation doesn’t win on merit alone; it has to outcompete incumbents with their own institutions and interests.
What eventually tipped the balance was practical commerce plus a new technology: expanding Mediterranean trade kept exposing more merchants and scholars to the efficiency of positional arithmetic, and the arrival of the printing press in the fifteenth century let standardized digit forms spread far faster than handwritten manuscripts ever could. By the sixteenth century, Hindu-Arabic numerals had largely displaced Roman numerals in European mathematics, science, and commerce.
A shared inheritance, still visible today
So when someone asks who invented Arabic numerals, the honest answer is layered: the positional decimal system and the concept of zero as a written digit trace to India; the system was studied, refined, and explained in enduring form by scholars working in Baghdad, above all al-Khwarizmi; it was carried across the Islamic world through Cairo and into al-Andalus, splitting into Eastern and Western branches along the way; and it was popularized in Europe by figures like Fibonacci before slowly winning out over centuries of institutional resistance. It is, in the truest sense, a shared human inheritance — no single culture invented it in isolation, and no single culture can claim sole ownership of it now.
That’s part of why we built the Al Awaal the way we did. Its dial carries the Eastern Arabic numerals ٠ through ٩ — the branch of this millennium-long story that stayed closest to the numerals first written down in Baghdad — on a clean 41mm stainless steel case with a quartz movement, luminous hands, and 3 ATM water resistance, available in white or black for €110 with a gift box and free shipping across the Netherlands and Belgium. It isn’t a gimmick or a decoration; it’s a small, daily, legible link to where our numbers actually come from. If you want the fuller picture of how these numerals work on watch dials generally, our Arabic numeral watches guide is a good next stop, and you can read more about why we started making watches in Rotterdam on our about page.
Frequently asked questions
Who actually invented Arabic numerals?
No single person invented them. The positional decimal system and the digit for zero developed in India, likely over generations, building on earlier Brahmi numerals. Scholars in the Islamic world, most notably al-Khwarizmi in ninth-century Baghdad, studied, systematized, and wrote about this “Hindu reckoning,” and it was through Arabic-language scholarship and trade that the system reached Europe.
That’s why historians generally call them “Hindu-Arabic numerals” — the name credits both the Indian origin and the Arabic-world transmission, rather than assigning invention to one culture alone.
Why are they called “Arabic numerals” if they came from India?
Europeans encountered the system through Arabic texts, traders, and scholars, particularly via al-Andalus and North Africa, and later through Latin translations of Arabic mathematical treatises such as al-Khwarizmi’s. The name stuck to the transmission route rather than the point of origin, similar to how “Damascus steel” or other trade-route names describe how something arrived rather than where every idea behind it began.
In much of the Arabic-speaking world today, these numerals are in fact called al-arqam al-hindiyyah, “the Indian numerals,” which is a more direct acknowledgment of their origin.
What’s the difference between Eastern and Western Arabic numerals?
Eastern Arabic numerals (٠١٢٣٤٥٦٧٨٩) are used today across much of the Arab world alongside Arabic script. Western Arabic numerals (0123456789) are what most of the world, including this article, uses daily. Both descend from the same Indian-origin, Baghdad-refined system, but their glyph shapes diverged as the numerals spread west through North Africa and into Europe over the medieval period.
Our guide to Eastern Arabic numerals ٠–٩ breaks down each digit shape individually if you want to learn to read them.
When did Europe start using these numerals instead of Roman numerals?
The numerals reached Europe by the tenth or eleventh century through scholarly and Latin translations of Arabic texts, but widespread adoption took far longer. Fibonacci’s 1202 Liber Abaci is usually credited as the turning point for merchant and mathematical use, yet resistance persisted for centuries — Florence banned the numerals in account books in 1299 out of fraud concerns. It was really the spread of printing in the fifteenth century, combined with the ongoing practical advantages for trade and calculation, that finally let Hindu-Arabic numerals overtake Roman numerals across Europe by around the sixteenth century.