Let me help you with your invoice concerns in QuickBooks, @PYINFO.

Sometimes local internet cache files stored in the system can cause unexpected behavior in the product. This might be the reason why you're seeing a letter T next to the total of your line item. 

To check, we can run some basic troubleshooting steps to determine the issue. Let's start by accessing your account in a private window. This is also known as incognito which doesn't record your browsing activity. 

Here's how:

• Press Ctrl + Shift + N (Google Chrome).
• Ctrl + Shift + P (Firefox).
• Control + Option + P (Safari).

Once done. try creating a sample invoice and check if you're still seeing the letter. 

If not, go back to your regular browser and clear its cache. If yes, try using another supported browser. The issue might steam from the browser itself. 

Also, I'll be adding this handy resource to help track your sales in QuickBooks Online: How to see your best sellers, what’s on hand, the cost of goods, and more.

Please keep me posted if you have any other concerns when creating your transactions in QuickBooks. I want to make sure everything is taken care of for you. You can reach out to the Community at any time. Take care and have a great day!