WordNet (r) 3.0 (2006):

zag
    n 1: an angular shape characterized by sharp turns in
         alternating directions [syn: zigzag, zig, zag]

Moby Thesaurus II by Grady Ward, 1.0:

42 Moby Thesaurus words for "zag":
   L, angle, angle off, apex, bend, bifurcate, bifurcation, bight,
   branch, cant, chevron, coin, corner, crank, crankiness, crankle,
   crook, crookedness, crotchet, deflection, dogleg, elbow, ell,
   flexuosity, fork, furcate, furcation, hairpin, hook, inflection,
   knee, nook, point, quoin, stagger, swerve, switchback, veer,
   vertex, zig, zigzag, zigzaggery