As of 2015, Acronym Finder has 34 different meanings for the PEO acronym, with the highest-rated meanings being professional engineers Ontario and performing engineering operations. Some other common meanings for PEO are professional employer organizations and philanthropic educational organization.
One organization promoting the PEO acronym as a philanthropic educational organization is the "PEO Sisterhood," an organization that helps women with educational grants and loans. The organization also claims that the original meaning of PEO, established by the founders, can only be known by members of the organization.
Professional employer organizations act as human resources experts to help businesses manage their employee matters like health benefits, compensation, payroll and compliance. Outsourcing these areas to professional employer organizations allows a business to focus on its primary aspects and growing its bottom line.
As of 2015, PEO is also a stock symbol for the Adams Natural Resources Fund.