Party wipe

A party wipe (sometimes also called a total party kill, TPK, total party wipe(out), or TPW) in occurs when the entire party of player characters dies, leaving no survivors to continue the campaign.

From the Tropedia:

Unlocks and achievements
The Stone Table can be unlocked in the Lore Store after three total party wipes. Additionally, there is an achievement awarded to players for their first party wipe.