A check routing symbol is a set of numbers appearing as the denominator of a fraction that is printed in the upper right corner of any check. ... "Key to Routing Numbers." Accessed Feb. 16, 2022.

Your credit card is more than just the 16 digits you use for transactions. Each symbol and number on your card serves a purpose, whether for fraud protection or simplifying transactions.

How the Brain Maps Symbols to Numbers. New research shows the prefrontal cortex handles the work of associating numerals with matching quantities. By Nikhil Swaminathan.