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For years after 2009, twenty eleven, twenty fourteen, etc. are more common, even in years earlier than 2009 BC/BCE. Likewise, the years after 1009 (until 1099) are also read in the same manner (e.g. 1015 is either ten fifteen or, rarely, one thousand fifteen ).
The reception of Arabic numerals in the West was gradual and lukewarm, as other numeral systems circulated in addition to the older Roman numbers. As a discipline, the first to adopt Arabic numerals as part of their own writings were astronomers and astrologists, evidenced from manuscripts surviving from mid-12th-century Bavaria.
As a biprime with proper divisors 1, 3 and 7, twenty-one has a prime aliquot sum of 11 within an aliquot sequence containing only one composite number (21, 11, 1, 0); it is the second composite number with an aliquot sum of 11, following 18. 21 is the first member of the second cluster of consecutive discrete semiprimes (21, 22), where the next such cluster is (33, 34, 35).
Rūḥ or The Spirit (Arabic: الروح, al-rūḥ) is mentioned twenty one times in the Quran, where it is described as issuing from command of God. The spirit acts as an agent of divine action or communication. The Quran describes the Rūḥ in various ways.
Ḫāʾ, Khāʾ, or Xe (خ, transliterated as ḫ , ḵ , kh or ẖ ) is one of the six letters the Arabic alphabet added to the twenty-two inherited from the Phoenician alphabet (the others being ṯāʼ, ḏāl, ḍād, ẓāʼ, ġayn). It is based on the ḥāʾ ح.
Ẓāʾ, or ḏ̣āʾ (ظ), is the seventeenth letter of the Arabic alphabet, one of the six letters not in the twenty-two akin to the Phoenician alphabet (the others being ṯāʾ, ḫāʾ, ḏāl, ḍād, ġayn).
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Ṯāʾ (ث) is the fourth letter of the Arabic alphabet, [1] one of the six letters not in the twenty-two akin to the Phoenician alphabet (the others being ḫāʾ, ḏāl, ḍād, ẓāʾ, ġayn). In Modern Standard Arabic it represents the voiceless dental fricative [ θ ] , also found in English as the " th " in words such as "thank" and ...