noun
personal pension; private annuity
A pension plan that an individual arranges privately, distinct from the public national pension system. Common in financial and retirement planning contexts.
老後に備えて個人年金に加入した。
I joined a personal pension plan to prepare for retirement.
Compound of 個人 (individual) and 年金 (pension). The term is a straightforward modern financial term with no obscure historical derivation.