Notional accounts are designed to mimic a defined contribution plan, where the pension depends on contributions and investment returns. (For this reason, they are sometimes called notional, defined-contribution schemes). Pension contributions are tracked in accounts which earn a rate of return. However, in notional accounts, the return that contributions earn is a notional one, set by the government, not the product of investment returns in the markets.
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Notional accounts : notional defined contribution plans as a pension reform strategy : Notional accounts: notional defined contribution plans as a pension reform strategy (English). World Bank pension reform primer series Washington, DC: World Bank. http://documents.worldbank.org/curated/en/524371468322154992