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3 is numeric as you have it written, as opposed to "three" which is written as a word.
It is -3.
Code 39 is the simplest of alpha-numeric barcodes to use that does not require a check digit to be calculated. Although there is a Mod43 Check digit that is required by standard for LOGMARS and HBIC barcodes. The Code 39 barcode is also known as 3 of 9 Barcode, Code 3 of 9 and Bar Code 39.
Numerical value = absolute value = a number's distance from zero on the number line.For example, |3| = 3, and | -3| = 3. So we can say that -3 and 3 are 3 units from zero.
To write 3 alpha characters and 1 numeric character, you can choose any three letters from the alphabet (A-Z) and combine them with a single numeric digit (0-9). For example, you could write "ABC1" or "XYZ7".