The phrase "strict rules" refers to a set of guidelines or standards that are enforced with great rigor and formality. These rules are typically clear, specific, and leave no room for interpretation or deviation. When someone talks about strict rules, they often imply that there is little to no flexibility in how the rules are applied, and any violation of them may result in consequences such as punishment or discipline. In other words, "strict rules" refer to a system where adherence to protocols is strictly monitored and enforced.