100y or 1-H may refer to:
Science Hydrogen (1H), a chemical element 1H, a number of chemical compounds with one hydrogen atom Hydrogen-1 (1H, or Protium), an isotope of hydrogen 1H, a grouping within an Astronomical catalog 1H 1617-155, a designation for the Scorpius X-1 X-ray source 1H 1908+047, a designation for the SS 433 star system Astra 1H, an SES satellite launched in 1999
Other uses 1H, a model of Nissan H engine 1H NMR, a type of Proton NMR 1 H. Cas, a variant notation for AR Cassiopeiae UH-1H, a type of Bell UH-1 Iroquois Campath-1H, a brand of Alemtuzumab Ardiden 1H, a model of HAL/Turbomeca Shakti Blendkörper 1H, smoke grenade used by Germany in World War II SSH 1H, alternate name for Washington State Route 534 1H, one hour 1H Year, 1st half of year
See also H1 (disambiguation)