Over time, Oracle has been adding more contextual information into each allocated heap memory chunk, to make it easier to see what for your heap memory is used. This instrumentation is used for private (PGA,UGA,etc) heaps too, but this article focuses only on shared pool heaps.
A few examples from past are:
Library cache object hash values added to allocated shared pool chunk names (2010) The above technique is used for some other allocation types too, like KKSSP^NNN allocations that are used for “session pages” that hold various tiny memory structures like library cache lock (and pin in older DB versions) that a session must allocate when accessing library cache objects. - Linux, Oracle, SQL performance tuning and troubleshooting - consulting & training.

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Learn about Oracle shared pool internals and how to interpret allocated chunk status indicators in heap dumps.

Oracle Shared Pool Internals: Allocated Chunk Status Indicators in Heap Dumps