资料来源 : Webster's Revised Unabridged Dictionary (1913)

Convoy pennant \Con"voy pen"nant\
   A white pennant with red border, carried : (a) Forward on all
   vessels on convoy duty. (b) Alone by a senior officer present
   during evolutions or drills, when it commands ``Silence.''
   (c) Over a signal number, when it refers to the signal number
   of an officer in the Annual Navy Register.