Icons are used in the Surname Index and individual Person pages to indicate relationships and other items of interest, as shown below.  If you hover your mouse over a relationship icon, its function is shown without you having to refer back to this page.

means this is a direct ancestor of a living Ferguson
means this is the sibling or cousin of a living Ferguson's ancestor
means this is a spouse of a Ferguson sibling or cousin (i.e. married to one denoted by the icon above)
means there are photos of this person and/or events in their life
means, on a Person page, that there are other photos for this person that may be shown by clicking on the camera icon