Does anyone know how to explain the various elements of the Hong Kong Permanent Resident Identity Card, or the meaning of each component (what does each number represent?)

Hong Kong’s identity card numbers are issued sequentially and have no implicit meaning.

Format: English letters (the elderly are usually A or B, most adults are English letters after that, such as D, E, etc. Most teenagers [around 20 years old] nowadays are Z, and now most children are Y, most recent immigrants from the mainland are V) The last character of the Hong Kong ID card number is the number in brackets, which is calculated based on an equation. Assuming that the six characters of the pier are Z687485, the English letter Z must be converted into numbers first. , which is 26, multiplied by 8 (if it is Y, it is 25, and so on), and then multiply each number by 7, 6, 5, 4, 3, and 2 from left to right.