A unit of length, = 1.0 × 10⁻¹² meter, or a millionth of a micron. Proposed in 1944¹ and so far as we know never used. For an explanation of its purpose, please see the sources note for definition 2 of spat.

1. Leon Callou. Au sujet de deux nouvelles unités secondaires métriques.
Séance of 10 January 1944.
Comptes Rendus hebdomaires des Séances de L'Académie des Sciences, vol. 218, Jan-June 1944, page 66.

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