The Hebrew word yamin denotes the right hand, the right side, and by extension, the south (since ancient Hebrews oriented themselves facing east, putting south to the right). It occurs over 130 times in the Old Testament. The right hand was the hand of power, favor, skill, and covenant oath.
The theological significance of the right hand in Scripture is immense. God's right hand is His instrument of salvation, power, and exaltation (Exodus 15:6; Psalm 118:16). The Messiah is invited to sit at God's right hand (Psalm 110:1 — the most quoted OT verse in the NT). Believers are seated at the right side in positions of honor. To be at someone's right hand meant protection and advocacy. The final judgment places the righteous at Christ's right (Matthew 25:33).