If you have a 401(k) with a former employer, it's called an orphan. The name is fitting, since you aren't really taking care of this account -- it's sitting there all by itself.
If you are still covered by a pension plan through your employer, your benefits may not be worth as much as you think. In July 2012 the Pension Funding Relief Act Map-21 became a law. Future retirees may not feel the impact of this legislation for several years-- a common theme these days as our government attempts to dodge every fastball the economy throws at it.