30

Thirty.

30.

Treinta.

Thirty is:

The number of days in the months April, June, September and November (and in unusual circumstances February - see February 30).

The total number of major and minor keys in Western tonal music, including enharmonic equivalents.

In years of marriage, the pearl wedding anniversary.

The duration of the Thirty Years' War.

Used to indicate the end of a wire service story. (Possibly a corruption of German fertig -
"finished, ready" or in journalistic context "end of story"?)

The code for international direct dial phone calls to Greece.

The house number of 30 St Mary Axe (The Gherkin)

The designation of Interstate 30, a freeway that runs from Texas to Arkansas.

The designation of U.S. Route 30, a highway that runs from Oregon to New Jersey.

Various other routes have been numbered "30"; for example, New York State Route 30 which runs from the Pennsylvania border to the Canadian border.

The designation of E30, the European route from Cork to Samara.

The number of tracks on The Beatles' eponymous album, usually known as The White Album.

Part of the name of:
Thirty odd foot of grunts, the band fronted by actor Russell Crowe

In the title of the movie 13 Going on 30, starring Jennifer Garner.

In the title of the Food Network show 30 Minute Meals.

The number of cars in the Nintendo 64 game F-Zero X.

Historical years: 30 A.D., 30 B.C., or 1930
-30-, a motion picture about work in a Los Angeles newspaper, starring Jack Webb and William Conrad

Also a stage in young adulthood.

The number that New York Rangers goalie Henrik Lundqvist wears in the NHL. Lundqvist wore
35 in Sweden, but since number 35 is retired by the Rangers for former goalie Mike Richter, he chose 30 instead.

From...Wikipedia...