Hebdo-
Obsolete SI unit prefix
Hebdo- (symbol H) is an obsolete decimal metric prefix equal to 107. It is derived from the Greek hebdοmos (Greek: ἕβδομος) meaning seventh.
The definition of one hebdomometre or hebdometre as 10000000 metres was originally proposed by Rudolf Clausius for use in an absolute electrodynamic system of units named the quadrant-eleventhgram-second system (QES system) in the 1880s. It was based on the meridional definition of the metre, which established one ten-millionth of an Earth quadrant, or the distance from the geographical pole to the equator, as a metre.
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