D4, D.IV, d4 or variants may refer to:
D4, D.IV, d4 or variants may refer to:
==Science and medicine== 22-Dihydroergocalciferol, vitamin D4 D4-isoprostane, a type of isoprostane ATC code D04, Antipruritics, including antihistamines, anesthetics, etc., a subgroup of the Anatomical Therapeutic Chemical Classification System D04, Carcinoma in situ of skin ICD-10 code Dopamine receptor D4, a human gene Octamethylcyclotetrasiloxane, called D4
Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).