Defined Contribution vs Defined Benefit
Company pensions are generally termed a "defined benefit" meaning your service is somehow evaluated to determine the amount paid you for some fixed term or life. The 401K alternative is a "defined contribution" program, meaning that some amount is contributed to you now instead of a promised pension later.
The term "401K" is widely understood - and liked. Maybe a similar name like "402K" or "501K" or "42U" (4 percent to you) could be coined, and repeated often to get people saying and thinking along 401K lines.