Also called: square · quadrangle mark · double square · the shield

Where on the hand: On any mount or line; very often forming around a break in a line.

What it looks like: Four lines enclosing a four-sided figure. It often forms around a break in a line, boxing the gap in.

Universally auspicious — the protective mark. It gives protection from danger in the domain where it sits: a shield. Around a break in any line, it repairs that break.