Читать книгу The Element Encyclopedia of Secret Signs and Symbols - Adele Nozedar - Страница 232

There’s a common phrase, “on the square” or “on the level.” This means to be open, honest, proper, and above board, and springs directly from Masonic practice and ritual.

All the symbolism of the square and of the number 4 is applicable to this tool; it stands for solidity, respect, security.