I played a cleric of Torm for awhile who's holy symbol was her right gauntlet. She also wore the pendant around her neck, and also had it emblazoned on her sword as well, but the gauntlet was her foci.
A friend of mine's cleric of Pelor has the pendant as well as having the symbol emblazoned on the shield. Later on, the party dwarf tattooed it on his left bicep. I have no clue which one is the foci, but I think it'd either be the pendant or the shield one.
In that same group, I had a male ranger who had his deity's symbol (Ehlonna) tattooed on his left bicep. Later on, he got a silver symbol pendant. He multi-classed into cleric for a level before his final demise.
My half-dragon paladin of Tyr has her's emblazoned on her tabard she wears over her armor.