The %TriggerBase% token returns the trigger type.
The token will return one of these, which corresponds exactly to the name of each trigger as shown when clicking the New Trigger button:
Hot Key Trigger Global Macro Palette Trigger Status Menu Trigger Typed String Trigger Application Trigger Audio Output Changed Trigger Clipboard Changed Trigger Clipboard Filter Trigger Cron Trigger Dragged File Trigger Engine Launch Trigger Focused Window Trigger Folder Trigger Gesture Trigger Idle Trigger Login Trigger MIDI Trigger Mounted Volume Trigger Periodic Trigger Public Web Trigger Remote Trigger Sleep Trigger Time of Day Trigger USB Device Key Trigger USB Device Trigger Wake Trigger Wireless Network Trigger