Can a Monk who has multi-classed with Cleric, via Initiate of the Faith, use a Holy Symbol as their Ki Focus?
... see the semi-related question at rpg
... my thinking here is* ... Whilst maybe they can use a Holy Symbol for their powers with the Implement key word, the section "Monks and Weapons" on p.64 of PHB3, refers specifically to Ki Focus, not a generic Implement
It also seems like the Ki Focus takes the same "slot" as the Holy Symbol, as it also provides the benefit even when wore, much like the Holy Symbol.
The glossary on Ki Focuses, PHB3 p.203 / [ddi] seems to indicate the Ki Focus is separate from a weapon.
If you have both a magic ki focus and a magic weapon, you choose before you use an attack power whether to draw on the magic of the ki focus or that of the weapon.
Items have two separate entries for Holy Symbol and Ki Focus...