esoterica
/ˌɛsəˈtɛrɪkə/
noun
- Items, writings, or subjects that are intended for or understood by only a small group of people with specialized knowledge.
- His library contained a vast collection of esoterica on ancient religions.
- Collectors of esoterica often pay high prices for rare manuscripts.
- The antique shop was full of esoterica, from old alchemy texts to strange scientific instruments.