There are no standard rules for what goes in box 14, and no standard codes or abbreviations. The employer can put pretty much whatever they want in that box. I would assume that RETIR has something to do with retirement, but it is not a common entry for box 14. You have to ask your employer what it is. When you know exactly what it is, we will be able to tell you what category to select.
Employers can put just about anything in box 14; it's a catch-all for items that don't have their own dedicated box on the W-2.
In TurboTax, enter the description from your W-2's box 14 on the first field in the row. Enter the dollar amount and select the correct tax category that goes with that description.
If none of the categories apply, scroll to the bottom of the list and choose Other–not on above list. Don’t worry. We'll figure out if it impacts your return or not. If we need more information, we'll ask you.
In your case, it sounds like your employer listed the amount either they or you contributed to a retirement plan.