The oral mucosa in the area of crenation is usually of normal color, but there may be erythema (redness) if exposed to a high degree of friction or pressure. Crenated tongue is usually asymptomatic and harmless.
ROM stands for read-only memory. It's used to store the start-up instructions for a computer, also known as the firmware. Most modern computers use flash-based ROM. It is part of the BIOS chip, which is located on the motherboard.
ECC RAM is typically used in computer servers and in financial computing where error-detection is very important to protect computer data. Memory chips with ECC are able to detect and/or correct common errors at the time of storage and transport of data.