Etiquette and P's and q's

Etiquette noun - Personal conduct or behavior as evaluated by an accepted standard of appropriateness for a social or professional setting.

P's and q's and etiquette are semantically related in usual topic. In some cases you can use "P's and q's" instead a noun "Etiquette".

Etiquette and p's and q's are semantically related in usual topic. You can use "Etiquette" instead a noun phrase "P's and q's".