I want to know the answer to the following question:
What may be contracted into single characters?
All the background I'm provided with is that "Some of these can be considered logograms, where characters represent whole words rather than syllable-morphemes, though these are generally instead considered ligatures or abbreviations (similar to scribal abbreviations, such as & for "et"), and as non-standard.". Is that enough to answer the question?
Answer: no