Object- or extended- relational databases (Oracle 12c, DB2, ...)
It attempts to “add OO-ness to tables.”
All database information is still in tables, but some of the tabular entries can have richer data structure, termed abstract data types (ADTs); i.e., the column values are NOT restricted by the first normal form rule (1NF).
The 1NF is the domain of each attribute contains only atomic values, and the value of each attribute contains only a single value from that domain.