1: κέντρον
(Strong's #2759 — Noun Neuter — kentron — ken'-tron )

from kenteo, "to prick," denotes (a) "a sting," Revelation 9:10; metaphorically, of sin as the "sting" of death, 1—Corinthians 15:55,56; (b) "a goad," Acts 26:14 , RV, "goad" (marg., "goads"), for AV, "pricks" (in some mss. also in Acts 9:5 ), said of the promptings and misgivings which Saul of Tarsus had resisted before conversion.