Same! I tried making an L, reflecting it, and then rotating the two around to merge them into a T shape, but I just got question marks. :/
Yes factoris don't yet have the technology to reflect rotated letters, nor rotate reflected letters. Try just using a rotated L, and thinking of what's left in the T have you remove the rotated L?
I thought I tried that though, and it gave me an F. Maybe I was doing something wrong.
I'm crying because this game seems really fun, but my baby brain can't figure out how to make a T. My stupidity knows no bounds.