Caltrop, an antipersonnel weapon made up of two or more sharp nails or spines arranged in such a manner that one of them always points upward from a stable base (for example, a tetrahedron)
Alabama spike, a species of freshwater mussel, an aquatic bivalve mollusk in the family Unionidae, the river mussels
Brother spike, a species of freshwater mussel, an aquatic bivalve mollusk in the family Unionidae, the river mussels
Diffraction spike, lines radiating from bright light sources in reflecting telescope images
False spike, a species of freshwater mussel, an aquatic bivalve mollusk in the family Unionidae, the river mussels
Fern spike, the occurrence of abundant fern spores in the fossil record, usually immediately (in a geological sense) after an extinction event
Other uses
Bird control spike, a device consisting of long, needle-like rods used for bird control
Spike (computer science), an Agile programming term for a minimal prototype implementation of some system functionality that nonetheless encompasses the entire range of system operability
Spike (music), a part of certain stringed instruments
Spike (journalism), to decide not to publish or make public, a matter of concern in journalism ethics and standards
Mickey Finn (drugs), drink spiking: to covertly put alcohol or another intoxicating substance in a drink that previously did not contain such substances
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