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- Geiger counter, a device for detecting radiation
- Geiger-Müller tube, the sensing element of the a Geiger counter
- Geiger-Marsden experiment, a 1909 physics experiment
- Geiger-Nuttall law, an empirical 1911 rule relating alpha decay energy to decay half-life
- Geiger Tree (Cordia sebestena), a species of flowering plant
- Geiger (corporation), a promotional products company
- Geiger (comics), a minor, teenage Marvel Comics super-heroine
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