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Kaliuzhkin

Using standard algebraic notation, is there a generally accepted notation for "whatever?"

For example, doing exercise 163 in Chess School 1a by Sergey Ivashchenko, The Manual of Chess Combinations (Russian Chess House), I want to express 163) 1. Ba3xc6 Q to c6, c5, d7, b6 or a5 2. Bd6xRb8.  In its answer, the book uses figurines and only gives black's move as [what would be] 2...Qb6. 

Is there a symbolic representation of black's move?  I recall seeing this in The Oxford Companion to Chess, but don't remember the details.