BuddyPress.org

OK… Maybe not a string. A Word then perhaps?

A word is a string.
A string is a type of variable – text – example: unfriend
An integer is a type of variable without a decimal point – number – example: 33
A float is a type of variable – number with a decimal point – example: 45.67

Again – the string ‘unfriend’ is not coming from BuddyPress – unless you have edited it.