- 六方会谈 liùfānghuìtán Six-Party TalksThe series of diplomatic negotiations (2003–2007) involving China, the US, North Korea, South Korea, Japan, and Russia regarding North Korea's nuclear program.
- 六方最密堆积 liùfāngzuìmìduījī hexagonal close-packedhexagonal close-packed (HCP) structure in geometry or materials science