V$LOCK_ELEMENT

Columns
   ___________________________
 
   LOCK_ELEMENT_ADDR
   INDX
   CLASS
   LOCK_ELEMENT_NAME
   MODE_HELD
   BLOCK_COUNT
   RELEASING
   ACQUIRING
   INVALID
   FLAGS

Related:

V$ENQUEUE_LOCK 
V$EVENT_NAME 
V$LATCH 
V$LOCK 
V$_LOCK
V$LOCKED_OBJECT 
V$LOCKS_WITH_COLLISIONS 
V$LOCK_ACTIVITY 
V$RESOURCE  
V$RESOURCE_LIMIT 
V$TRANSACTION_ENQUEUE