What does a square on the fate line mean?

What this means

First confirm that the mark is a small enclosed square on or around the vertical fate line, not random crossing wrinkles or a photo artifact.

Palmistry often reads squares as protective signs, especially when they surround a break, weak point, island or difficult section of the line.

Compare whether the fate line continues clearly after the square, plus the head line, sun line, support lines and both hands before drawing a strong conclusion.