Services Sector ETF
  
See: Exchange-Traded Fund (ETF).
What services? Well, law firms are a service. But not many are publicly traded. Banks are a service. At least...investment banks are. Sorta. There are oil and gas processing services. That might count.
The key notion: the services sector is about people (professionals)...doing stuff. It's not about robots manufacturing items or units for sale in and around stores. Less leverage in business operations. Just sales of human time...with a markup.