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tetrabolo
tetrabolo n. 
/tɛˈtrabələʊ/, /tɛˈtræb(ə)loʊ/ a polyabolo composed of four triangles. [ < tetra- comb. form + -abolo (in diabolo n.), by deliberately false analogy (see quot. 1961).]
Brit. /tᵻˈtrabələʊ/
, /tᵻˈtrabələʊ//tɛˈtrabələʊ/U.S. /təˈtræb(ə)loʊ/
, /təˈtræb(ə)loʊ//tɛˈtræb(ə)loʊ/ΘΚΠ
the world > relative properties > number > geometry > shape or figure > [noun] > two-dimensional > other
amblygon1570
obliquea1608
triangulate1610
pelecoid1706
leaf1716
oblongitude1739
hexagram1863
polystigm1863
tetragram1863
tetrastigm1863
trigram1882
tetromino1954
tromino1954
tetrabolo1961
Penrose tile1975
1961 New Scientist 21 Dec. 752/3 Mr. S. J. Collins..has experimented with the various plane shapes that can be formed by edgewise joins of four isosceles right-angled triangles; for these he most ingeniously suggests the name ‘tetraboloes’. His excuse is that a ‘diabolo’ has two such triangles in its cross-section (joined pointwise, not edgewise: but no matter!).
1967 Sci. Amer. June 129/1 The pieces had been suggested to him by S. J. Collins of Bristol, England, who gave the name ‘tetraboloes’ to the order-4 set because the Diabolo, a juggling toy, has two isosceles right triangles in its cross section. This implies the generic name ‘polyaboloes’.
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