flag
  • Something utilized to notify, remind, identify, comment, or warn.
  • In computers, a marker, code, or sequence of bits which serves as a flag (1). For example, such a flag indicating the end of a process, or an error condition.
  • In communications, a marker, code, or sequence of bits which serves as a flag (1). For example, such a flag indicating the end of a transmission, or notifying of an upcoming control code.

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