clev·is 
(klĕvĭs)
(klĕvĭs)n.
A U-shaped metal piece with holes in each end through which a pin or bolt is run, used as a fastening device.
[From clevi, possibly of Scandinavian origin; akin to Old Norse klofi, cleft; see gleubh- in the Appendix of Indo-European roots.]
clevis