#atozchallenge X is for...

 ⊗ MARKS THE SPOT 
For Part of Fortune

It's a stretch I know... but the glyph looks like an X and the ⊗ PART OF FORTUNE; It is an Arabic Part, and the most well-known one. (I think)

Wherever the part of fortune is found in the natal chart is the place where a person is thought to possess natural talent.