The Hebrew noun seh refers to a single head of small livestock — a lamb or kid (young goat) from the flock. It is the word used for the Passover lamb (Exodus 12:3, 5), the daily sacrifice, and Isaiah's suffering servant compared to a lamb led to slaughter. It represents the basic sacrificial animal.
Seh is the Passover word. In Exodus 12:3-5, each household was to take a seh — one per household — and slaughter it at twilight. The blood on the doorpost would cause the destroyer to pass over. This single lamb for each household foreshadows the single Lamb for all humanity. Isaiah 53:7 draws the line explicitly: the Servant is like a seh led to slaughter, silent before its shearers. John the Baptist applies this directly to Jesus: "Look, the Lamb of God" (John 1:29). Revelation's climax features not a lion on the throne but a Lamb — slain yet standing (Revelation 5:6). The seh of Exodus becomes the cosmic Lamb of eternity.