In Chinese, some characters representing numbers are so trivially forgible by adding a stroke or two (1 = 一, 2 = 二, 3 = 三, 10 = 十, 1000 = 千) that accountants came up with complicated substitutes that cannot be altered to mean any other number (1 = 壹, 2 = 贰, 3 = 叁, 10 = 拾, 1000 = 仟). The substitutes are still widely used in legal and financial documents.