The risk_profile also know as investor profile defines a numerical scale to represent the customer’s willingness and/or capacity to take on financial risk.
As described in this Article from the CFA Institute:
Current regulations reflect the complexity surrounding risk profiling, with many generally vague as to what factors influence a risk profile. Current regulatory guidance also differs among countries
The scale is based on an internal assessment made by the reporting intitution. It is presented in ascendant order from 1 to 10. However, the reporting instituion does not need to define 10 different risk profiles. This means:
If the reporting instituion has defined 5 different profiles for their investors, a risk_profile of 1 will represent the most conservative investors, while a risk_profile of 5 will represent the most risky ones.