I assume you are asking about box 14 on a W-2. There are no rules or standards for the information in W-2 box 14, or for any abbreviations that are used. The employer can put pretty much whatever they want in that box. If you don't know what TD is, ask your employer to explain it. If it's not in the list of categories in TurboTax, select "Other (not classified)."
My guess is that TD stands for Temporary Disability. Did you work in Rhode Island? In the list of categories I see "Rhode Island TDI tax." That might be what it is. But don't rely on my guess. Ask your employer what it is.