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It's the Greek letter that looks like E (similar to €)
A synonym is something that means the same or similar to something else. Just think, "Same, Similar." The first letter of 'synonym' is "s". Same with the word "same/similar". So the "s" in "synonym" means same, similar. Easy right??
A zalambdodont is a creature which has teeth with two ridges which meet at an angle, thus forming a shape similar to the Greek letter lambda (Λ).
I believe that you are asking about the number zero, rather than the letter O which looks quite similar. Zero is defined as a quantity of exactly nothing.
Yes, D is symmetrical. This letter have corresponding parts. Though if you draw a line down the center of D, you can't get two similar halves. But if you draw a horizontal line, you will see them. So the letter D is horizontal symmetry.