The reading passage from the strange case of Dr Jekyll and Mr. Hyde is example what literary term?

It's difficult to say definitively what literary term the passage you're referring to exemplifies without knowing the passage itself. However, "The Strange Case of Dr. Jekyll and Mr. Hyde" is rich in literary terms, and some common possibilities include:

* Gothic literature: This genre is characterized by suspense, horror, the supernatural, and often explores dark themes of duality and the human psyche. The novel fits this description with its exploration of the split personalities of Dr. Jekyll and Mr. Hyde.

* Symbolism: Many elements within the novel, such as the duality of Jekyll and Hyde, the physical transformations, the setting of London's foggy streets, and the overall sense of darkness and secrecy, are symbolic representations of larger ideas.

* Foreshadowing: The novel often uses subtle hints and foreshadowing to build suspense and hint at the eventual transformation and downfall of Dr. Jekyll.

* Irony: The juxtaposition of Jekyll's respectable facade and Hyde's monstrous nature creates a stark irony, highlighting the hidden darkness within seemingly good people.

* Allegory: The novel can be interpreted as an allegory for the duality of human nature, the conflict between good and evil, and the dangers of repressed desires.

To determine which specific literary term is most relevant to your passage, please provide the text, and I'd be happy to analyze it further.