No, in fact, China does not use any alphabet. Chinese uses a system of thousands of symbols that represent ideas. (alphabets contain letters that only represent sounds).
Yes, the Aztecs had a writing system known as Nahuatl, which used pictorial symbols and glyphs to represent words and concepts. This writing system was mainly used for codices (manuscript books) and official inscriptions. The Codex Mendoza is one of the most famous surviving Aztec codices.
It took about 2 years at the most!
China's writing system contained thousands of different characters, most Chinese printers found moveable type impractical.
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A bar and a line
The Mayans developed a sophisticated writing system that included hieroglyphs to record historical events, rituals, and astronomy. Their system of writing was one of the most advanced in Mesoamerica and remains one of the few fully deciphered ancient writing systems.
The Chinese system of writing was difficult to learn because it used a complex system of symbols. The Kanji of the Asian languages are difficult to master because one must learn the strokes and their order to execute it properly.
Alphabetic writing is generally not complicated by definition, since it replaced complicated picture-writing. The most complicated alphabet would be a matter of opinion. Arabic is usually thought of as complicated. It has 28 letters (29 if you include Hamza), plus a system of about 12 symbols to represent vowels.
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Sumerian writing used cuneiform (Latin: "wedge-shaped") characters that had developed from pictographs. This system never developed into an alphabet while it was being used to write Sumerian, or most of the other languages that adopted cuneiform writing (e.g., Akkadian and Old Persian). However, a true alphabet of cuneiform symbols was developed by the people of Ugarit to write their language, which was related to Hebrew. (Strictly speaking, Ugaritic cuneiform employed an abjad, which is a term for an alphabetic system that lacks vowels.)
The Hindu/Arabic system of writing numbers is the sytem which is used in most countries of the world. The Hindu/Arabic numbers are... 1, 2, 3, 4, 5, 6, 7, 8, 9 and 0.
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