This code system http://terminology.hl7.org/CodeSystem/question-max-occurs defines the following codes:

CodeDisplayDefinition
* RepeatingElement can repeat an unlimited number of times.
<status value="draft"/><experimental value="false"/><date value="2020-08-20T17:41:31+10:00"/><publisher value="HL7 (FHIR Project)"/><contact><telecom><system value="url"/><value value="http://hl7.org/fhir"/></telecom><telecom><system value="email"/><value value="fhir@lists.hl7.org"/></telecom></contact><description value="Flags an element as having unlimited repetitions."/><caseSensitive value="true"/><valueSet value="http://hl7.org/fhir/ValueSet/question-max-occurs"/><content value="complete"/><concept><code value="*"/><display value="Repeating"/><definition value="Element can repeat an unlimited number of times."/></concept></CodeSystem>