τετράδιον G5069
tetrádion · tet-rad'-ee-on · Noun Neuter
neuter of a presumed derivative of (a tetrad; from τέσσαρες); a quaternion or squad (picket) of four Roman soldiers:--quaternion.
1 Occurrence in the King James Bible
Acts 12:4And when he had apprehended him, he put him in prison, and delivered him to four quaternions of soldiers to keep him; intending after Easter to bring him forth to the people.