1. obscure or specialized knowledge, items, or subjects intended for or understood by only a small group of people with special interest or knowledge
Usage: plural noun; often used to refer to collectible items or arcane information

Examples

• The antique shop specialized in esoterica from the Victorian era.
• His collection of esoterica included rare manuscripts and occult texts.
• The professor’s lecture was filled with esoterica that only graduate students could appreciate.
• She spent hours browsing online forums dedicated to musical esoterica.
• The bookstore’s back room contained esoterica on subjects ranging from alchemy to ancient languages.
• Collectors of esoterica often pay high prices for unusual items.
• The museum’s esoterica section featured artifacts that few visitors understood.