What is "electorum"

An electorum is the minimum number of voters required to take part in a ballot to allow its result to be valid. It is similar to a quorum but applies specifically to ballots where voters (electors) cast their votes without a meeting taking place. Examples of an electorum in use include a referendum to change a country's constitution requiring a minimum turnout such as the Serbian constitutional referendum, 2006, in which a minimum turnout of 50% was required. In the alternative vote system, an electorum is not possible due to the multiple nature of the voting.