A node is a logical object on the load balancer that identifies the IP address of a physical resource on the network.You can explicitly create a node, or you can instruct Local Traffic Manager to automatically create one when you add a pool member to a load balancing pool.
You can find out the status of node from it’s symbol
A pool in the simplest term is a grouping of servers. A pool is a collection of one or more servers, referred to as members. The pool is where the type of load balancing desired is chosen, where some options such as rate limiting, load balancing and SNAT are applied, and one of the most important of the many layers of monitoring that can be applied to an application’s stack within a BIG-IP. Monitoring the pool level is important because it will allow you a clear representation of which groups of servers are or aren’t available at a given time. Each VIP has the option of selecting a default pool, but it is also possible to direct to another pool should the primary pool be unavailable.
You can find out the status of pool from it’s symbol
These symbols are come in handy when you are troubleshooting issue. The people who are not familiar with F5 i’m attaching the demo of Virtual map screen so they can understand about symbols