From LimeSurvey Manual
A text value to be suffixed to a text entry box. The sufix is shown just right of the input.
On little screen : sufix is shown below the input. If you want to leave it at right (New in 3.0.0 ) : add suffix-prefix-force class to the question.
- Any character or set of characters you wish to be displayed after the input
Entering a value of "%" for this attribute would result in a percentage sign being displayed immediately after the text input box.