i only know one it is juxtaposition. it is when there is no multiplication sign when one is needed. i.e. 3(1+3)=12
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j can be used in place of i. They mean the same thing and it's down to personal choice. They both stand for the square root of -1 in algebra.
Juxtaposition is multiplication by placing things together without a multiplication symbol between them (50/2)(8+5).