Antihydrogen is the antimatter counterpart of hydrogen.
Ħ (minuscule: ħ) is a letter of the Latin alphabet, derived from H with the addition of a bar.
Imperial College London (officially Imperial College of Science, Technology and Medicine) is a public research university located in London, United Kingdom.
The Planck constant (denoted, also called Planck's constant) is a physical constant that is the quantum of action, central in quantum mechanics.
The Steyr AUG (Armee-Universal-Gewehr—"universal army rifle") is an Austrian 5.56×45mm NATO bullpup assault rifle, designed in the 1960s by Steyr-Daimler-Puch and now manufactured by Steyr Mannlicher GmbH & Co KG.
Tacet is Latin which translates literally into English as "(it) is silent" (pronounced:,; or). It is a musical term to indicate that an instrument or voice does not sound, also known as a rest.