What is at the end of a rainbow?

Riddle: What is at the end of a rainbow ?

Answer: The letter W.

Hint: Think letters, not weather.

Why this answer works
It’s a wordplay riddle: the word “rainbow” ends with the letter W—no leprechauns required.

Fun fact
The color order people memorize for rainbows is “ROYGBIV” (red → violet), but a real rainbow can show extra faint bands called supernumerary arcs.

Popular variations
End of a rainbow, no gold? → “W”
What’s after all the colors? → The letter “W”

Related riddles
What comes once in a minute, twice in a moment, but never in a thousand years? → The letter “M”
What begins with T, ends with T, and is filled with T? → A teapot

FAQ
Is “a pot of gold” valid?
Fun folklore, but the riddle’s trick is about spelling.
Why not “violet”?
Violet is a color band, not “the end” the riddle is asking for.