pentalpha

from The Collaborative International Dictionary of English v.0.48

Pentalpha \Pen*tal"pha\, n. [NL., fr. Gr. ?: cf. F. pentalpha.
   See {Penta-}, and {Alpha}.]
   A five-pointed star, resembling five alphas joined at their
   bases; -- used as a symbol.
   [1913 Webster]