You need to look for the stock certificates (paper) and find out the name of the company.
Ticker symbols get recycled. That company may have had ASFX in the 1960's, then when it got acquired, merged, or delisted, ASFX became an unused ticker symbol. Decades later, in 2003, when Vencap Capital Corp. changed their name to American Scientific Resources, Inc., they likely applied to change their ticker symbol to ASFX.