"Your password should be at least 10 characters that include upper and lower case characters, numbers and symbols, " he said.

BBC: Hacking group Anonymous latest victim of Twitter hack

The passwords generally should be complicated, combining letters, numbers and symbols.

CNN: Twitter hack raises questions about 'cloud computing'

However the company offers tips for all of its users going forward, including using strong passwords that mix numbers and symbols with upper- and lowercase letters, not using the same password for multiple accounts, and disabling Java.

CNN: Twitter hacked; 250,000 accounts affected

We drove through the city when, as you all remember, the symbols on the door -- the circle with the X and the four numbers that denoted how people were here, how many people were lost, whether or not -- making sure everybody was accounted for.

WHITEHOUSE: 10/14/09: White House Press Briefing

Their numbers grew from four to about 20, making them the largest herd of hippos outside of Africa and famous symbols of the cocaine industry.

BBC: Inside Pablo Escobar��s Medell��n cartel