The term CDI is mentioned nowhere in my various online broker accounts. In the portfolio overview it also says:
"ALLKEM LTD. (3O10)
AU0000193666|A3C8Z7
Aktien" ("stocks")
I know that there are certain companies that are traded as ADRs. (American Depositary Receipts) When I buy one of those it explicitely shows me that I have ADRs in my online broker account.