There are several synonyms for the term "z-DNA", which refers to a DNA structure that has a left-handed helical twist instead of the more common right-handed twist. This unusual structure can play a role in gene regulation and DNA replication. Some synonyms for z-DNA include left-handed DNA, Z-form DNA, and zigzag DNA. Researchers studying this structure may also refer to it as an oddity or anomaly of DNA structure, since it differs from the typical structure of DNA. Understanding the properties and functions of z-DNA could provide valuable insights into the mechanisms of DNA replication and gene expression.