Magic number and Sphinx

Magic number noun - The atomic number of an extra stable strongly bound atomic nucleus: 2, 8, 20, 28, 50, 82 or 126.

Sphinx and magic number are semantically related. In some cases you can use "Sphinx" instead a noun phrase "Magic number".

Sphinx noun - One of a number of large stone statues with the body of a lion and the head of a man that were built by the ancient Egyptians.

Magic number and sphinx are semantically related. Sometimes you can use "Magic number" instead a noun "Sphinx".