There is no such word. This is a probably a mis-spelling either of "symmetry" or of "cementery".
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only one.You see i learned this at school.
If you canfold something in half and the two sides are identical then the fold is a line of symmetry. A circle has an infinite lines of symmetry because you can fold it in infinite places and it will always be the same. An oval has two - you can fold it the long way or the short way.