Passage blockers are terms used to describe obstacles that prevent the passage of something. NOES and NAYS are two such terms, both with four letters. NOES is an acronym for 'No Other Expected Solutions' and is used to indicate that no other solutions are available. NAYS is an acronym for 'Not Acceptable Yet' and is used to indicate that a solution is not yet acceptable. Both terms are used to block the passage of something, whether it be a solution or an idea.