Back sight

backsight

[bak-sahyt]
noun Surveying.
1.
a sight on a previously occupied instrument station.
2.
(in leveling) the reading on a rod that is held on a point of known elevation, used in computing the elevation of the instrument.

Origin:
1840–50; back2 + sight

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World English Dictionary
backsight (ˈbækˌsaɪt)
 
n
1.  the sight of a rifle nearer the stock
2.  surveying Compare foresight a reading taken looking backwards to a previously occupied station

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