X STANDS FOR ?
Xavier is a name not to common, will you agree,
Exit sounds like an x but only a word to be.
X-ray is a picture, one that shows inside,
X marks the spot, where a treasure may be.
Extra is something more although it appears to start with x,
An x could be a wife or husband, it could be the start of xylophone.
Excellent is very good but this does not begin with x, only sounds like it,
An x is a most unusual letter, many stories are told using this,
X stands for ?, more than is probably thought of.