This help article explains the visual elements of the RadAutoCompleteBox control.
Description of Elements
Could also be referred to as "box", "input", etc. This is where the search
text is typed.
Could also be referred to as "popup" or "dropdown". The suggestions from the
autocomplete box's datasource that match the search string are displayed in this list, which appears upon typing in the textbox.
Could also be referred to as "item" or "suggestion". Represents a single data
item from the control's datasource, that matches the search string provided.