Passwords for all accounts should be 10 characters long and include upper and lower case letters, numbers, and special characters.

FORBES: NSA: Protect Your Work Accounts by Beefing Up Home Networking Security

She writes it confidently and proudly, lower case letters and all.

CNN: Saving Aesha

One of their biggest decisions, which caused upset among conservative commentators at the time, was to opt for a combination of upper and lower case letters.

BBC: The road sign as design classic