Abstract: A fence post comprising male and female members. Each member has a circumferential transverse shape of a portion of a plane geometric figure. A key on the male member is slidingly interlocked with a keyway on the female member to connect the members together. Fence rails are attached together via the fence post, and one of the fence post members can be inverted to alter the orientation of fence rails with respect to each other. Zig-zag fence configurations can thus be defined as easily as straight line fence configurations.