Modifiers matching pit:

• open,
• deep,
• symmetric,

Simple categories matching symmetric:

• shape,
• cell,
• processing,
• part,
• object,
• function,
• polyhedron,
• pit,
• space,
• site,
• surface,
• crystal,
• window,
• polygon,
• structure,
• system,
• interface,
• loop,
• phase,
• form,
• material,
• figure,
• center,
• container,
• pattern,