Avacchekakatva Nirakti Śiromani refers to the logical explanation (Nirukti) of a 'delimiter' or 'limiter' (avacchedaka) as formulated by the legendary 16th century Navya- Nyāya Philosopher Raghunātha Śiromani. It is a foundational, highly advanced text within Indian Epistomology and formal logic. Dī.A is noted in the margin of the text. Perhaps it denotes the abbreviation of Dīdhiti. Avaccedaka. (Dīdhitīkā on Avaccedaks)