1fe9841a_on_Manager___LimeSurvey_Manual__Meaning
[Color] tan background [Sample] Sample [Tooltip] none [Comments] Anything within curly braces that is recognized as an equation (e.g. there is no leading or trailing whitepace) will be color-coded with a tan background to help distinguish it from surrounding text [Meaning] 
the whole equation
Expression Manager - LimeSurvey Manual
Meaning