X is the 24th letter of the English alphabet. It has been depicted as a Muppet character, on occasion.

Used in various Sesame Street sketches as a prop or concept, the Letter X has also appeared as a Muppet character on multiple occasions, such as being serenaded by Patti LaBelle or as a mystery guest on Mystery Guest.

The letter first sponsored Episode 0006.

Songs about X

"X Marks the Spot!"
(First: Episode 0351)

"Oh, How I Miss My X"
(First: Episode 2168)

"X Train"
(First: Episode 2610)

"If It Weren't for You, X"
(First: Episode 3659)

"X - X-Ray Song"
(First: Episode 4206)

"Hurray for X"
(First: Episode 4313)

"X Salute"
(First: Episode 4313)

"The Letter of the Day: X"
(First: Episode 4516)

Segments about X

Words with X
(First: Episode 0006)

Ernie and Bert: Letter X
(First: Episode 0007)

Ernie and Bert: Ernie's X
(First: Episode 0008)

Brand X
(First: Episode 0010)

X marks the treasure
(First: Episode 0013)

X-ident
(First: Episode 0013)

X - X-ray
(First: Episode 0064)

The Great Alphonso
(First: Episode 0299)

"Brand X"
(First: Episode 0299)

Cowboy X
(First: Episode 0325)

Alphabet Dancers
(First: Episode 0456)

Harvey Kneeslapper: X Marks the Spot
(First: Episode 0456)

"The Letter X"
(First: Episode 0482)

Ernie, Bert and Shola talk about X
(First: Episode 0560)

Sand X
(First: Episode 0638)

The Typewriter: X - X-ray
(First: Episode 0787)

X - exit
(First: Episode 1184)

Upside-down X
(First: Episode 1426)

Mystery Guest
(First: Episode 1447)

Grover shows Debo a letter X
(First: Episode 1494)

Ask Oscar
(First: Episode 2573)

X with colorful triangles
(First: Episode 2779)

Typeface X
(First: Episode 2862)

X song
(First: Episode 2929)

Stamped and Painted
(First: Episode 2934)

Underwater
(First: Episode 3341)

X-ball
(First: Episode 3506)

Wegman's Dogs
(First: Episode 3535)

X on the Beach
(First: Episode 3588)

Grover watches Matthew type an X
(First: Episode 3904)

The Letter of the Day: X - X-ray
(First: Episode 4018)

Giant X
(First: Episode 4018)

Measure of a Letter
(First: Episode 4018)

Baby Talk
(First: Episode 4080)

The Letter of the Day: Nest Sale
(First: Episode 4174)

The Letter of the Day: Rap
(First: Episode 4206)

Street stories and sketches about X

Rosita has an X to land on when she flies
Episode 3341

X feels useless
Episode 3424

X decides to quit the alphabet
Episode 3659

Mystery X
Episode 3833

The Reading Club
Episode 3862

(Letter) X-Games
Episode 3894

Elmo and Snuffy play pirates searching for an X
Episode 3904

The Letter of the Day Show
Episode 4313

International X

X in Mexico
(EKA: Episodio 756)

Xochitl
(EKA: Episodio 827)

Lapicito Uppercase X
(EKA: Episodio 833)

Lapicito Lowercase X
(EKA: Episodio 879)

A plane writes the letter X over the Golden Gate Bridge
(EKA: Folge 2329)

"X - Xilfono"
(EKA: Episodio 1015)

A xilifono (xylophone) makes the letter X out of itself.

See also

• Twitter, social media website currently known as X.