Hi All,

       Any good Microsoft recommended index naming standard sql server. as follows,

PK_   for primary keys
UK_   for unique keys
IX_   for non clustered non unique indexes
UX_   for unique indexes
FK_   for foreign keys
CIX_ for Clustered Index
? for Include Index
? for filter

Filter Index - FIx

Covering Index - COVIx

(Referece: http://sqlmag.com/blog/sql-server-index-naming-guidelines)