Select the cell where you want the tick mark
Go to the Insert tab
Click Symbol
Choose Wingdings or Wingdings 2 font
Select the tick mark symbol
Click Insert
Click Close
Use the keyboard shortcut Alt + 0252 for a tick mark in Wingdings font
Copy and paste a tick mark from another cell
Use the CHAR function with the appropriate font
Insert a check box from the Developer tab if you want an interactive tick mark