Position Limit
  
No, this is not a kama sutra thing.
Some investment funds have limits on exposure, like, "You can't have more than 10% of the fund exposed to telecommunications stocks," or "You can't have more than 20% of the fund in bonds or cash at any time; you have to be fully invested."
There's a given investment position that is limited by the charter or indentures of the fund itself. So you really wanted to make GE a 25% position at $9 when you thought it was going to $20 next year...but you couldn't, because your fund has a position limit.
Sorry, Charlie. Bring other good things to life.