Hey you! Yes, you! Thank you for adding beauty to the world!
Definitions of Heu:
name: A surname (very rare: popularity rank in the U.S.: #40487)
noun: Initialism of highly-enriched uranium. [(nuclear physics, military) Enriched uranium containing at least 20% uranium-235 (some applications, such as fission weapons and naval reactors, use uranium enriched to as high as 80-95% uranium-235), and therefore capable of sustaining a nuclear fission chain reaction without needing a moderator; used in nuclear weapons and in a few types of nuclear reactors requiring very high power density or high neutron flux.]