Icons and ideographic symbols developed by primitive people are the prototypes of modern letters, such as cuneiform and hieroglyphics. The earliest alphabet is an early hieroglyphic combination used by the Semitic people in the East (known as the northern branch of Semite in modern classification), which appeared between 1700 BC and 1500 BC.
BC 1000, there are four other kinds of letters, which are developed from the Semitic letters in the east, and the letters used by the southern branch of the Semitic people in the west (called the southern branch of Semite in modern classification), Canaanite letters, Arabic letters and Greek letters. Around 500 BC, the Roman alphabet evolved from the Greek alphabet. By 20 15, all languages in western Europe (including Irish, Dutch, French, German and other languages) will use this alphabet.
1, a phonological term. The representative word of initials, abbreviated as "mother". Wang Songying-lin's Yuhai Wen Yi Primary School: "Guang (Sima Guang) has a note on cutting words, with 384 sounds in 36 words." In the Qing Dynasty, Qian Daxin wrote "A New Record of Letters of Fasting by Ten Drivers": "Thirty-six letters were unknown before the Tang Dynasty. According to legend, heating monks is also the shaman's heating in the late Tang Dynasty.
2. The minimum writing unit of pinyin characters or phonetic symbols. Such as: English letters; Chinese Pinyin.