Final answer:
During a bomb threat, Code Red is commonly used to indicate an immediate threat, but the code can vary by institution.
Step-by-step explanation:
During a bomb threat, the specific code members should use can vary depending on the institution's emergency protocol. However, commonly, Code Red is used to signify an immediate threat to the safety and wellbeing of individuals within a building or area, which can include a bomb threat. It is important to note that institutions have different emergency codes, and it's vital to be familiar with the specific procedures and codes of the particular place you are in.