You can get a lot of symbols by using the Alt key and up to three digits. E.g. Alt +253 gives the squared symbol ², Alt +252 gives the cubed symbol ³, Alt +171 gives ½. Unfortunately, they are not exactly easy to memorise, and don't (as far as i know) give you all the symbols you are likely to need. If you are in a 'Word'-type programme you can go 'Insert' > 'symbol' then get pages of symbols and foreign language letters. You can then copy and paste them from there to a boz like this that does not have an Insert option