marlinespike

/M AA1 R L AH0 N IH0 S P AY1 K/
noun
  1. 1

    A tool, consisting of a pointed metal spike, used to manipulate the strands of rope or cable when knotting and splicing.

Source: https://en.wiktionary.org/wiki/marlinespike, https://en.wiktionary.org/wiki/marlinspike