There isn't a single universally recognized symbol for "does not apply." The best way to represent "does not apply" depends on the context. Here are some common options:

For data tables and forms:

* N/A: This is the most common abbreviation for "not applicable."

* -: A hyphen can be used, especially in data tables.

* Blank cell: Sometimes leaving a cell blank can indicate that the information doesn't apply.

For mathematical and logical statements:

* ¬: This symbol represents "not" and can be used to negate a statement. For example, ¬(A = B) means "A does not equal B."

* ≠: This symbol means "not equal to" and can be used to indicate that two things are different.

For other situations:

* "Does not apply" (or "D.N.A.") This is straightforward and clear, but might be too verbose in some contexts.

* "Not applicable" This is another clear and concise option.

Important: When choosing a symbol, make sure it's clear and unambiguous to your audience. You can also use a legend or explanation to define the meaning of the symbol if necessary.