The concepts of TODOs and Round Tuits are quite similar, but the "TODO" notation is generally confined to fields of work/study where tasks left undone are more clearly identified, while Round Tuits are the term used by more philosophical fields where those who procrastinate have only the vaguest idea of "something that might be useful" in something they might get around to hallucinating about later.

Round Tuit as a notation is seldom seen, since most who would use that terminology never write down anything intelligible enough to provide a basis for planning ahead. They may talk about Round Tuits out of conviction that they fully expect (usually by miraculous revelation) to somehow get a Round Tuit.

Round Tuits are an almost exclusive province of those of us who have achieved wisdom through age, while TODOs belong to the hopeful wannabe achievers of younger generations where promises are lightly made and then - as in the current case - frequently forgotten.

A TODO to some degree represents a promise, while a Round Tuit (for most of us) only expresses an interest(?).

John