When looking up individual characters in modern dictionaries, I often come across descriptions such as "one of the ten Heavenly Stems", "nth Earthly Branch", "one of the Eight Trigrams", etc.
- Is it something relevant for modern Chinese?
- Do people generally know that 甲 is the first heavenly stem, 丑 is the second earthly branch, and so on?
- Are they used in modern expressions?
Edit: I can see that 天干, 地支 and 八卦 are still important and serious learners should know about them. One more question: how about the 64 hexagrams (易經六十四卦)? Are they also used for counting or enumeration, or in some fixed expressions?