During colonial times here in North America, the pineapple became a symbol of hospitality. In fact, you'll still see the sign of the pineapple on various inns and restaurants on the East Coast in more historical spots.
Colonists visiting one another was the primary means of entertainment, cultural intercourse and the sharing of news. (I'm sure that they didn't mind the fellowship either - as people who were sharing similar hardships in life!) Certainly, they were more community minded that today's society tends to be.
One of the ways which the colonial wives would show hospitality and honor to their guests was to prepare creative food displays. The food display showed off both the woman's personality, creativity and the family's wealth or desire to show honor to their guest. Pineapples were a sweet treat and delicacy and any woman who wanted to seriously impress (or bless) would try to obtain a pineapple for her dinner guest. Dinners were special and oftentimes extravagant affairs. The women in the colonies took special care in preparation and presentation - putting a great deal of careful thought into the meal and evening plans.
We've selected it as a simple statement on this site that we endeavor to learn how to excel in the art and practice of hospitality - not for personal gain or recognition - but for the glory of God. Each and every one of us has something to share and something to learn from the discussions on Offering Hospitality. We set a pineapple on our "table" here to show you how much we value your fellowship and input as we learn how to practice biblical hospitality.
To learn more about the interesting history of the symbol of the pineapple, check out this site for a brief tutorial.