“Control + Shift + 6” (keyboard shortcut), the suitable classification is:

In Microsoft Excel, the keyboard shortcut Ctrl + Shift + 6 is used to apply the Scientific Number Format to the selected cell or range of cells. This formatting style displays numbers in exponential notation, which is commonly used for representing very large or very small numbers in a compact form. For example, a number like 123000 may be displayed as 1.23E+05 after applying the scientific format. This shortcut is especially useful for students, engineers, scientists, and professionals who frequently work with numerical data requiring scientific representation. Instead of manually opening the Format Cells menu and selecting the Scientific option, users can quickly apply the format using this keyboard combination, improving efficiency while working in Microsoft Excel.