What is "board pennant"

Pennant \Pen"nant\, n. [OE. penon, penoun, pynoun, OF. penon, F. pennon, fr. L. penna feather. See Pen a feather, and cf. Pennon, Pinion.] (Naut.)

1. A small flag; a pennon. The narrow pennant, or long pennant (called also whip or coach whip) is a long, narrow piece of bunting, carried at the masthead of a government vessel in commission. The board pennant is an oblong, nearly square flag, carried at the masthead of a commodore's vessel. ``With flags and pennants trimmed.''
   --Drayton.

2. A rope or strap to which a purchase is hooked.