QS:Prefix
From LimeSurvey Manual
Prefix (prefix)
Description
A text value to be shown as prefix before the text input box(es). The prefix is shown just left of the input.
On little screen : prefix is show above the input. If you want to leave it at left (New in 3.0.0 ) : add suffix-prefix-force class to the question.
Example
Entering a value of "$" for this attribute would result in a dollar sign being displayed immediately preceding the text input box.