Looks like a brand of Solo 401k:
"What sets one plan apart from another are the fees and the products offered within each. For example, Waddell & Reed’s single-participant 401(k) plan, called the Exclusive K, requires no installation or setup fees but does charge an annual $15 custodial fee. “Participants can choose from 24 different mutual funds. You can have 1 fund or 15 funds and can mix and match,” says Deborah Zipp, assistant vice-president of retirement-plan-sales management for Waddell & Reed, a financial services firm based in Shawnee Mission, Kansas. - See more at: http://www.journalofaccountancy.com/issues/2003/mar/thesingleparticipant401k.html#sthash.t9xOnlFP.dpuf "
The Single-Participant 401(k)
I have both a Solo 401k and a Solo Roth 401k. The Roth's are a little harder to find.