Things understood by or meant for a select few, often relating to specialized knowledge or obscure information.

A collection of rare or obscure things, often referring to subjects that are not commonly understood.

अन्यथा ज्ञात वस्त्र

English Usage: The book is full of esoterica on ancient herbal remedies.

Hindi Usage: यह किताब प्राचीन जड़ी-बूटियों के इलाज के बारे में अन्यथा ज्ञात वस्त्रों से भरी हुई है।