Science, Technology and Engineering
- Half Rate (HR or GSM-HR), a speech coding system for GSM developed in the early 1990s
- Hayati-Roberts link frame convention (HR), a coordinate representation for a robotic device
- Hazard ratio, the effect of an explanatory variable on the hazard or risk of an event
- Heart rate (HR), a measure of the number of heart beats per minute (bpm)
- Hertzsprung–Russell diagram (H-R diagram or HRD, also known as a colour-magnitude diagram or CMD), used in understanding stellar evolution in astronomy and astrophysics
- High-Resolution High-Definition (HRHD, HR, HRHDTV or HR.HDTV), referring to an image resolution derived from high-definition video
- Homologous recombination, in genetics, the process in which genetic material is exchanged between two similar or identical strands of DNA
- hour (hr, although h is more common and the only recognized SI symbol)
- HR (gene) (Hairless homolog (mouse)), a gene which encodes a protein whose function has been linked to hair growth
- HR (software), a program that automatically forms mathematical theories by searching for sequences of numbers
- Hypersensitive response, a mechanism used by plants to prevent the spread of infection by microbial pathogens
- HR, a star catalogue symbol standing for Harvard observatory, Revised photometry
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Famous quotes containing the words technology and/or engineering:
“If we had a reliable way to label our toys good and bad, it would be easy to regulate technology wisely. But we can rarely see far enough ahead to know which road leads to damnation. Whoever concerns himself with big technology, either to push it forward or to stop it, is gambling in human lives.”
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