Code 93 was designed as a more compact Code 39: the same kind of value takes less room and reads more reliably. It's used in logistics, by some postal services and on electronic components.

What it holds
Characters	Letters in both cases, digits and every symbol on the keyboard - no accented letters.
Length	Up to 107 characters, where a lowercase letter or a symbol other than space - . $ / + % counts as two.
Check digit	Always two check characters, C and K, worked out by Labeljoy. They're in the bars, not in the readable text.
Readable text	The value, under or over the bars.

Characters you can't type. A tilde followed by three digits is the character with that code - ~009 is a tab - and ~~ is a tilde.

The rest of the settings - text position, quiet zone, color - are in the Barcode section.

What goes wrong
Invalid characters in input data.	The value has a character Code 93 can't hold, such as an accented letter.
Input data too long.	Too many characters for one barcode.