"The Tyger" was a poem written by Earth poet William Blake in the late 18th century. (TOS: "Charlie X")
Charlie Evans forced Commander Spock to recite the first two lines of the poem, when he was taking command of the USS Enterprise in 2266:
- Tyger! Tyger! burning bright
- In the forests of the night
"Tyger" is the spelling used by William Blake himself, although this is frequently modernised to "Tiger" in many versions.