Final answer:
External sites on a wide area connectivity map are usually denoted by circles, but the letter inside to represent suppliers or agents is not standardized.
Step-by-step explanation:
In a wide area connectivity map, external sites, such as suppliers or external agents, are usually denoted by symbols that allow for easy and clear understanding of the network diagram. While there is not a universal standard for these symbols, it is common to see circles used to represent external sites.
The specific letter contained within the circles can vary depending on the organization's notation system, but often letters like 'E' for 'external' or 'S' for 'supplier' could be used. However, without knowing the specific legend or key provided by the company or the creator of the connectivity map, determining which letter is used is not possible.
To correctly interpret a connectivity map, one should always look for a legend or key that defines what each symbol and letter stands for in that particular diagram. If you are creating your own map, be sure to use clear symbols and provide a legend for any letters or symbols used to define various entities such as external sites.
A legend or key is necessary to interpret these letters accurately, such as 'E' for external or 'S' for supplier.