Polar Chinese divides special symbols into 22 types and codes them specially. The basic rule of coding definition is two letters "z" plus two initial letters representing special symbol types. Commonly used special symbol codes are (please refer to the help document for all codes):

Zzbd punctuation mark zzpy pinyin symbol zzts special symbol

Mathematical symbol zzsx zzdw unit symbol zzjt or zzj arrow symbol

Zzys or ZZ turns zzpp radical

I don't know what the landlord is, and the symbol keys are different. Some can't.

PS: As the landlord said, five strokes typing should be very difficult.