There are multiple definitions:

1. hazardous waste incineration(English)

   • Pollution and health

2. hot water immersion(English)

   • hydrotherapy is widely used for the treatment and rehabilitation of patients, but it can also be applied to prevent diseases in healthy people
   • Rehabilitation, Preventive medicine, Therapeutic approaches
   • https://www.ncb…les/PMC6479732/

3. Household Wealth Index(English)

   • a measure of household non-monetary income based on the possession of different assets
   • HCI
   • Financial issues, Social aspects
   • https://docs.wf…22418/download/