Nu

Nu could mean:

Nu, a letter in the Greek alphabet: lowercase ν, uppercase Ν
Nu (kana), the Japanese characters ぬ and ヌ
NU (sound project)
Nu (mythology), the male form of the Egyptian goddess Naunet
Nu (Chrono Trigger), a fictional species from the video game Chrono Trigger
.nu, the Internet top-level domain for Niue
Nu people, a Chinese ethnic group
Nu river or Salween River
U Nu or Mr. Nu, a former Burmese prime minister
Nǀu language, a moribund Tuu (Khoisan) language spoken by the Nǁnǂe people in South Africa
Nu Gundam, in the anime Mobile Suit Gundam: Char's Counterattack
"Nu"? is a Yiddish word meaning "so?" now also absorbed into English meaning "so, what's happening?" or "so, what do you say?"

In universities:

Naresuan University, a public university in Phitsanulok, Thailand
Niagara University, a Roman Catholic university in Niagara County, New York
Northwestern University, an American research institution in Evanston, Illinois
Northeastern University, an American research university in Boston, Massachusetts
Norwich University, a private American military and traditional university in Northfield, Vermont
National University (Philippines), a private, non-sectarian university in Manila, Philippines

In other abbreviations:

Nunavut (NU), the largest and newest territory in the territories of Canada
Nahdatul Ulama (NU), an Islamic group in Indonesia
Nusselt number (Nu), a dimensionless heat transfer ratio
Nucellar embryony (Nu+), a form of seed reproduction that occurs in certain plant species
Bhutanese ngultrum (Nu.), Bhutan's official currency

In codes:

In music: