breadcrumb

Short definition from Wiktionary

Noun

1. 1
   A tiny piece of bread, either one that falls from bread as it is cut or eaten, or one made deliberately by crumbling bread.
2. 2
   A single link in a chain indicating the hierarchical location of a directory, web page or similar, used as a navigation aid.
3. 3
   A fragment of data that serves to log the actions taken by a program, used in debugging.
4. 4
   One in a series of clues leading to a person or place.

Verb

1. 1
   To sprinkle breadcrumbs on to food, normally before cooking.
2. 2
   To add navigational breadcrumbs to (a web page or user interface).
3. 3
   To use clues or enticements to lead someone in the desired direction.