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spherogram
spherogram n. 
/ˈsfɛrəˌɡræm/ Mathematics (see quots.).
Brit. /ˈsfɪərə(ʊ)ɡram/
, /ˈsfɪərə(ʊ)ɡram/U.S. /ˈsfɪrəˌɡræm/
, /ˈsfɪrəˌɡræm//ˈsfɛrəˌɡræm/ΚΠ
1870 A. Cayley Coll. Math. Papers (1894) VII. 403 In the figures called ‘spherograms’..the representation of a hemisphere is all that is required.
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