3 X 5 Inch Piece of Heavy Paper
Puzzle 18 of Team Building Pack
Question is: 3 X 5 Inch Piece of Heavy Paper
and the answer is: INDEXCARD
Word Meaning:
INDEX CARD — A piece of heavy paper stock used to record information to be stored in a card index or to supply the copy (content) from which to generate a book index.
Definitions from Wiktionary.