Lingaku- the ten Heavenly Stems 甲【jiǎ】, 乙【yǐ】, 丙【bǐng】, 丁【dīng】, 戊【wù】, 己【jǐ】, 庚【gēng】, 辛【xīn】, 壬【rén】, 癸【guǐ】 (used cyclically in the calendar and as ordinal number like Roman I, II, III)
Generated: This term refers to a system of ten symbols used in Chinese culture, primarily for calendrical purposes, which represent a sequence that is used repeatedly.
The ten Heavenly Stems are used in the traditional calendar to mark years.