The shortcut F3 allows you to select the Type Filter typically, which is used in a list page. F3 will take you to the filter without you having to click on the search bar.
You can use the filter to search for a great number of things including Name, Phone No., Contact, and No. For example, you could choose to filter on a No. with 10000 or for a range such as 10000...30000. You could search for a Name and use keywords, or choose to search for names ending with ies by using the filter *ies.
Pro tip: Use F1 while in your filter box to access the Help function, which shows you a table of Entering Criteria in Filters. This Help table has many useful filters.
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