zero
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they made stone heads
A math concept is how you solve a math problem or the ideas. You usually have to memorize math concepts.
"key concept" is not a mathematical term . A key concept is an important idea. Two key concepts in math are derivatives and integrals of functions. ( "function" is also a key concept.)
There is no such concept in maths. A plane figure is a mathematical concept but that is not what the question is about.
In common with the other Mesoamerican civilizations, the Maya used a base 20 (vigesimal) and base 5 numbering system (see Maya numerals). Also, the preclassic Maya and their neighbors independently developed the concept of zero by 36 BC