Physical Sciences
- Trace radioisotope, an element that is found in small quantities because it undergoes radioactive decay
- Trace evidence, material found at a crime scene
- Trace element, in geochemistry, an element which composes less than 0.1% of a sample
- TRACE (Transition Region and Coronal Explorer), a NASA satellite
- Trace fossil, fossil record of biological activity
- Seismic trace, in seismology, record of ground movement from a seismograph.
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