𝐏𝐋𝐀𝐘 | 𝐓𝐇𝐄 𝐑𝐔𝐋𝐄 𝐁𝐎𝐎𝐊 | 𝐊𝐀𝐘 𝐅𝐋𝐎𝐂𝐊

- the regulations or standards of behavior that should be followed in a particular 𝐦𝐚𝐧𝐧𝐞𝐫 -

example:

once you memorize the 𝐫𝐮𝐥𝐞 𝐛𝐨𝐨𝐤, you'll never get 𝐩𝐥𝐚𝐲𝐞𝐝