Zhuang logogram
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Zhuang logograms or sawndip is a logogram created as a derivative characters of Han characters and used by Zhuang in Guangxi, China. In Chinese, it is called 古壮字 gǔ Zhuàngzì or 方塊壮字 fāngkuài Zhuàngzì, meaning old Zhuang or square faced Zhuang.
History
Sawndip is a Zhuang word, that means immature character. Though it is not clarified when was the time of its creation, but the present oldest record of this logograms is a stela built in 689, Tang dynasty. This logograms are used earlier than Vietnamese Chu Nom. It had been used for over 1300 years by Zhuang shamans to record poems and scriptures, until Romanized script for Zhuang language was created in 1957.
Some logograms are still used as a part of Han characters for Guangxi place names, such as 岜, bya for mountain or 崬 ndoeng for forest. Those characters are coded in Unicode ideograms, too.

