snake
n.— «Every time a team member feels as though a task they are responsible for is delayed, they write it down on a post-it note. The note includes the time lost (compared to if they didn’t have the delay), the thing affected, the cause, and their initials. They take the note and add it to the “end of the snake” which is a growing row of notes on the wall. Over time the snake is monitored for repetitive patterns.» —“Snake on the wall!” by Kevin E. Schlabach Agile Commentary (Philadelphia, Pennsylvania) Dec. 4, 2008. (source: Double-Tongued Dictionary)