[Query] which one to use .. abbreviated or sort name?

[AKHILESH KUMAR]

Hello 

If abbreviated and sort name are different which one to use ?  abbreviated or sort name ? 
example for nb_NO locale sort name are used in glibc 


abbreviated As per CLDR 

<day type="mon">man.</day> 
<day type="tue">tir.</day> 
<day type="wed">ons.</day> 
<day type="thu">tor.</day> 
<day type="fri">fre.</day> 
<day type="sat">lør.</day> 

short name As per CLDR 
<dayWidth type="short"> 
<day type="sun">sø.</day> 
<day type="mon">ma.</day> 
<day type="tue">ti.</day> 
<day type="wed">on.</day> 
<day type="thu">to.</day> 
<day type="fri">fr.</day> 
<day type="sat">lø.</day> 

Thanks and Regards,
Akhilesh Kumar