Long non-coding RNA (lncRNA) is a type of RNA molecule that is longer than 200 nucleotides and does not encode for proteins. When discussing lncRNA, there are several synonyms that can be used to refer to this type of molecule. Alternative names for lncRNA include long intervening non-coding RNA (lincRNA), large intergenic non-coding RNA (lincRNA), long intergenic non-coding RNA (long intergenic RNA, lincRNA), and natural antisense transcript (NAT). These different synonyms all refer to the same type of RNA molecule, and are often used interchangeably in scientific research. LncRNAs have been found to play important roles in gene regulation, and are the focus of many current studies in the field of molecular biology.