It is pretty annoying that they don't explain it better. My bet is Y is 
the long orientation of the package and X is at a right angle to that, 
both on a plane parallel to the circuit board.. Please report back and 
let us know.

Mike Hord wrote:

>>You could make a simple test jig to check the orientation 
>>(with gravity). Of course you're going to need to be carefull
>>not to solder the legs of, but it should't be do-able. If you've 
>>got a solder oven it should be a piece of cake.
>>    
>>
>
>Since the end result is essentially a test jig, that's what I'll
>do.  I marvel that this information is not bluntly and obviously
>presented in the datasheet.
>
>Mike H.
>
>  
>
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