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Explanation: You don't give us much to go on here, but it sounds like numbers/characters printed in relief (embossed), just like the kind you see on a credit card. If you run your fingers over the numbers, you can feel them because they're raised.
Explanation: 24. raise -- (bring (a surface, a design, etc.) into relief and cause to project; ``raised edges'' ) (http://poets.notredame.ac.jp/cgi-bin/wn)
Letters which aren't flush with the surface, but protuding. The opposite of embossed. (A-Z and 0-9 for alphanumeric characters)
Klaus Herrmann Germany Local time: 00:54 Native speaker of: German PRO pts in pair: 147