Cogwork

Crochet
Thread ?
First 3 rounds = triangle, 4 cm on each side
1.0 mm
500 yards (457 m)
53 x 27 cm; 10 1/2" x 20 3/4"
both US and UK
English Spanish

14 triangular motifs joined at 60 deg angles.

Pattern 5 in Magic Crochet.
Pattern 2, Union de Triangulos, in Ganchillo Artistico.