27C

27C is a code that may refer to several distinct concepts, depending on context. In everyday use, it most commonly denotes a temperature: 27°C, or 27 degrees Celsius, a unit of measurement on the Celsius scale. In weather reports and scientific data, it conveys a warm but not hot temperature; it equals 80.6°F.

In electronics and computing, 27C is part of the naming convention used for a family of non-volatile memory devices, typically PROM/EPROM/EEPROM, produced by various manufacturers. Devices bearing the 27C designation are used to store firmware and other permanent data in hardware; the exact type (EPROM vs EEPROM) and erase method vary by part number and supplier. Examples in the field include parts such as 27C64 or 27C256, though the exact specifications depend on the manufacturer. With the rise of flash memory, these 27C devices have become less common in new designs but appear in older equipment and some hobbyist projects.

Other uses of the term 27C exist but are less common; the combination can appear in model numbers, catalog identifiers, or course codes and should be interpreted from the surrounding context.