code words

Q: I have a paper where I have written the name of Allah in a kind of code word that upon seeing it is not understandable to anyone. I have written that with pencil. So as I have not written Allah’s name in a proper manner, should I erase it?

Q: Can the respected Mufti please explain the use of blocks, numbers, and other characters and signs that Aamils use when writing out taweez? This appears to be the use of numerology and the use of black magic.