Recipiangle

Re`cip´i`an`gle

    (rė`sĭp´ĭ`ăņ`g'l)
n.1.An instrument with two arms that are pivoted together at one end, and a graduated arc, - used by military engineers for measuring and laying off angles of fortifications.
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.