صفر
SIFF-er or SAWF-er. The 'ṣ' sound is an emphatic 's' pronounced with the tongue lower and further back in the mouth than a regular 's', giving it a deeper, heavier quality. The 'i' vowel is short, like in 'sit.' The 'f' is pronounced as in English 'ف'. The final 'r' is slightly rolled. Stress is typically on the first syllable.
The number zero in Arabic is صفر (ṣifr), which is the origin of the English word "cipher" and "zero." In Modern Standard Arabic, it's written as ٠ in Arabic-Indic numerals or 0 in Western Arabic numerals. Zero is unique among Arabic numbers as it doesn't require gender agreement with nouns and stands alone as a mathematical concept rather than a counting number.
Zero (صفر) is grammatically exceptional in Arabic because it doesn't follow the typical number-noun agreement patterns. Unlike numbers 1-10 which require gender agreement, صفر remains invariable regardless of the gender of the noun it might conceptually relate to. Zero doesn't take counted nouns in the typical Arabic counting structure; instead, it's usually used independently or with nouns in descriptive phrases using prepositions. When zero appears in compound numbers (like 10, 20, 30), it's written as part of the numeral but not pronounced separately. In mathematical contexts, صفر functions as a noun itself and can take case endings based on its grammatical role in the sentence (صفرٌ in nominative, صفرًا in accusative, صفرٍ in genitive). The word صفر is masculine grammatically, though this rarely affects usage since it doesn't modify other nouns directly.
The Arabic word صفر (ṣifr) represents one of the most significant contributions of Islamic civilization to world mathematics. Medieval Islamic mathematicians, particularly Al-Khwarizmi in the 9th century, systematized the use of zero as both a placeholder and a number in its own right, transmitting this concept from Indian mathematics to Europe through Arabic texts. The word ṣifr traveled into Latin as "zephirum," eventually becoming "zero" in English and "cifra" in many European languages, fundamentally changing mathematics and enabling modern computational systems.
The word صفر literally means "empty" or "void" in Arabic, perfectly capturing the concept of nothingness that zero represents. Interestingly, the same Arabic root (ṣ-f-r) gives us the word صَفَر (Ṣafar), the second month of the Islamic calendar, historically considered an "empty" or unlucky month in pre-Islamic Arabia. Before Arabic numerals spread to Europe, calculations were extraordinarily difficult; the introduction of zero through Arabic mathematical texts revolutionized commerce, astronomy, and science. In modern Arabic dialects, speakers sometimes use صفر colloquially to mean "nothing at all" or "absolutely none," as in ما عندي صفر فلوس (mā ʿindī ṣifr fulūs) - "I have zero money."