The blue nfipa label indicates what?

It signals the degree of health hazard. The National Fire Protection Association (NFPA) is good for alerting personnel of the degree of hazard in a particular chemical. They use diamond shapes to provide a quick visual representation of the flammability, health hazard, and other special hazards that a chemical may pose in case or during a fire. The blue color alerts people to health hazards and is located on the left of the diamond.

explanation:

so if you are under a school block you cant but it may also be do to you having to add it to your chrome book like an app like i did or its the wifi you have blocking it

building and maintaining the topology is difficult and time consuming. the chance of redundant connections is high, which adds to the high costs and potential for reduced efficiency.

explanation: