SPAM, the iconic canned meat created by Hormel Foods in 1937, has been a pantry staple for generations. But what exactly is it—and what does the name mean?

Though the true origin of the name remains unclear, popular guesses include “Shoulder of Pork And Ham” or “Specially Processed American Meat.” Interestingly, the name was suggested by actor Ken Daigneau, who won $100 in a company contest. SPAM is made from just six ingredients: pork with ham, salt, water, potato starch, sugar, and sodium nitrite (a preservative that helps prevent spoilage).