CPU is a common acronym for "Central Processing Unit". The CPU described a computer's primary processor.

To simplify international trade in electronic devices, the IEC (International Electrotechnical Commission) created the Certified Body scheme (CB scheme). The scheme was integrated in 1985 into the IEC.

The CE symbol is a logo confirming conformity with current EU regulations (CE comes from the French "Conformité Européenne"). A product bearing this testing symbol is confirmed as meeting specific product safety standards.