AAAA

AAAA refers to a sequence of four consecutive 'A' letters in a row. It commonly appears in genetics, where it represents a specific pattern of nitrogen bases in DNA or RNA sequences. In other contexts, such as domain names, AAAA is used to designate a type of DNS record that points a website domain to an IPv6 address. Overall, AAAA can denote a simple repeating pattern or a technical term depending on the field, but it consistently involves four 'A's in sequence.