The {} specifies that nothing should be placed before the items. Use \indent as needed. For those looking for an alternative solution: basically, you can pass anything in square brackets \begin{itemize}[...] \hspace{10pt} , \quad , etc.

Unordered (bulleted) lists are produced by the itemize environment, where each list entry starts by using the \item command, which also generates the bullet symbol.

LaTeX has three kinds of list environment: enumerate (numbered list) itemize (unnumbered list) description (unnumbered definition)

To create a numbered list in LaTeX, you can use the \begin{enumerate} command along with the \item command. You can also create sub-levels of the numbered lists by adding a sub-command within the greater enumerate environment.

The enumerate environment produces a numbered list. Enumerations can be nested within one another, up to four levels deep. They can also be nested within other paragraph-making environments. Each item of an enumerated list begins with an \item command.

LATEX distinguishes between three types of lists: bul- leted list, ordered list, and descriptive list. The bulleted list, where the order of elements is not im- portant, is called itemize. On the other hand, or- dered lists are termed enumerate, as their elements are numbered.

and with one of the following predefined options: triangle , circle square or ball or with a different symbol of your choice. To summarize: To globally change all itemize symbols of all third level itemize environments, add \setbeamertemplate{itemize subsubitem}[circle] to your preamble.