"and with signs": This is the staff, as it is written (Shemoth 4:17) "And this staff you shall take in your hand, wherewith you shall do the signs."
"and with wonders": This is the blood: as it is written (Joel 3:3) "And I will set wonders in heaven and earth: blood and fire and pillars of smoke."
Variantly: "with a strong hand": two. "with an outstretched arm: two. "and with great fears": two. "and with signs": two. "and with wonders": two. These are the ten plagues that the Holy One Blessed be He brought upon the Egyptians.