millihelen, n. — Green’s Dictionary of Slang

millihelen n.

also milihelen

[pun on Helen of Troy whose face ‘launched a thousand ships’, in Doctor Faustus (1604) by Christopher Marlowe, or, for men, on the Greek god Hermes]

(US campus) an imaginary unit of measurement to calculate female beauty; thus milliherm, for male beauty.

1969		Current Sl. I & II.
1974		G. Davenport ‘The Dawn in Erewhon’ in Tatlin! 172: Chest, back, abdomen lost milliherms because of paleness [...] His penis [...] was accorded the full complement of milliherms.
1986		T. Weller Science Made Stupid 🌐 Glossary: milliHelen: the amount of physical beauty required to launch one ship; 1/1000 of a Helen.
2002		‘scottinmn’ ‘Holiness Unit of Measurement’ 17 Oct. halfbakery.com 🌐 But returning to the main topic: measuring the immeasurable. Do you all know the basic unit of beauty? The miliHelen, which of course is the amount of beauty it takes to launch one ship.