Passage: The early Ming dynasty (Chinese: 明; pinyin: Míng, 1368–1644) also attempted to use paper currency in the early re-unification period. This currency also experienced rapid inflation and issues were suspended in 1450 although notes remained in circulation until 1573. It was only in the very last years of the Ming dynasty when Li Zicheng threatened Beijing in 1643 and 1645 that printing took place again. For most of the Ming China had a purely private system of currency for all important transactions. Silver, which flowed in from overseas, began to be used as a currency in the Far South province of Guangdong where it spread to the lower Yangzi region by 1423 when it became legal tender for payment of taxes. Provincial taxes had to be remitted to the capital in silver after 1465, salt producers had to pay in silver from 1475 and corvée exemptions had to be paid in silver from 1485. The Chinese demand for silver was met by Spanish imports from the Americas, in particular Potosí in Peru and Mexico, after the Spanish became established at Manila in 1571. It circulated as minted Spanish dollars sometimes stamped with Chinese characters known as "chop marks" which indicated that they were verified by a merchant and determined to be genuine. Spanish silver also circulated as ingots (known as sycee or yuanbao) which weighed a nominal liang (about 36 grammes) although purity and weight varied from region to region. The liang was often referred to by Europeans by the Malay term tael. The first Chinese yuan coins had the same specification as a Spanish dollar, leading to a continuing equivalence in some respects between the names "yuan" and "dollar" in the Chinese language.

Question: What were the names given to ingots of Spanish Silver?
sycee or yuanbao