Final answer:
During the second pass of the assembly process, if a symbol is not found in the symbol table, it signifies that the symbol represents a new label or variable in the program being assembled.
Step-by-step explanation:
During the second pass of the assembly process, if a symbol is not found in the symbol table, it signifies that the symbol represents a new label or variable in the program being assembled. This typically happens when the symbol is defined or referenced for the first time in the code. When a symbol is encountered for the first time, it is added to the symbol table for later reference.