OHM is the backed currency managed by the Olympus protocol.
https://docs.olympusdao.finance/main/
According to the theory, you cannot loose money on the long term, because each OHM is backed by at least 1 DAI. Incomes from Liquidity Pools are add to the Olympus DAO treasury, permanently increasing the available quantity of OHM. So the value of OHM can only be higher than 1 DAI.
This not an investment advice, make your own research.