biconvex, oval-shaped; “1074” and “2.5/1000” debossed on one side and plain on the reverse side; Bottle of 60 5mg/500mg – orange, biconvex, capsule-shaped; "1070" and "5/500" debossed on ...

In antiquity, we see examples of magnifying crystals formed into a biconvex shape as early as the 7th century BC. Whether the people of that period used them either for fire-starting purposes or ...