c note
When the IBM PC was first designed, it had no sound card, so the 'audible bell' character (ascii BEL or '\b') had to be linked to a tone emitted by the internal PC speaker. The designers chose C, and so a square-wave c emitted by a PC speaker is called a c-note. The audible bell is typically used for indicating particular types of error conditions -- for instance, using backspace at the beginning of a line. It is occasionally abused by BASIC programmers, because of the 'BEEP' command (which emits a c-note). Audible bell characters are also printed during the BIOS setup routines on some older machines.
The Urban Dictionary Mug

Loiks great
I had it drop-shipped and the recipient was very pleased. Thank you for the quick service and handling.
The coffee mug looks great and always draws comments from those seeing the first time.
perfect for when im expressing myself <3
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