You know what it looks like… but what is it called?
TAKE THE QUIZ“ABT”
We have one entry that includes the term ABT.
Abt system
noun: a system of tracking for mountain railroads in which two or more cograils are used and so arranged that the teeth are not opposite on any two of the rails
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- Arachnophobia is the fear of what multi-legged creatures?
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Merriam-Webster unabridged