Wikipedia has a pretty list which can be seen, for instance, in the page ‘A (Cyrillic)’ (in the table on the right with all the Cyrillic letters).
When looking at these weird letters, usually created under the Soviet Union, I have always wondered how they would look like in a text written in cursive, since handwritten Cyrillic is almost always in cursive. How would, for instance, Ԭ look like? I’m so curious!
Images are super welcome... And we could also talk about their aesthetics, if they ‘work’ in handwritten form or not... I love these things!