omphalos

center dead center

goal mark objective quintain target

direct hit hole in one home run

heart hub place

axis bull's-eye centrality centriole centrum core cynosure essence focus gist hotbed inside interior kernel mainstream marrow midpoint midst nave navel nucleus pith pivot polestar quick root seat

equidistance focal point intermediacy middle-of-the-road radial point

exterior exteriority outside

border boundary edge margin outskirts periphery rim surroundings

axis bull's-eye centrality centriole centrum core cynosure essence focus gist heart hotbed hub inside interior kernel mainstream marrow median middle midst nave navel nucleus pith pivot place polestar quick root seat

equidistance focal point intermediacy middle-of-the-road radial point

exterior exteriority outside surface