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the top part is called the spine and the spike like things are called teeth
The four spike-like pointed things on a fork are called tines.
i have a dog called spike!!
because spike lee is a known pot smoker
Spike Jonze
spike/ hit/attack
It was called "The Golden Spike". It also was known as "The Last Spike".
Thorn
You answered yourself. It is called a memo spike. See link
on tna on spike
Axe and Crampons(for your feet)
Catkin