Is there a way to know if trigger is invoked by the code from another trigger

["Naoko Reeves" <naoko@xxxxxxxxxxxx>]

Could you tell me if there is a way to know if trigger is invoked by the code from another trigger?

For instance, table A Trigger deletes table B record. While in table B trigger, I want to know whether this was triggered from table A.

 

Thank you,

Naoko