Usually written in black ink on red diamond-shaped paper, fu is affixed upside down.
This is because the phrase "to turn upside down" dao4, is also a pun on the word "arrived" dao4.
An upside down fu therefore means "Luck has arrived".
This good luck symbol is a popular decoration during Chinese New Year.
The bat bian3 fu2 is a symbol of good fortune. The fu in bat sounds the same as good fortune. A red bat is an extremely good fortune symbol.
This is a rebus for "Five Blessings Surround Longevity" wu3 fu2 peng3 shou4. The five blessings wu fu are: longevity, wealth, health, love of virtue, and natural death.
Five bats (representing each blessing) surrounding the stylised Chinese character for longevity shou is a rebus for wu fu peng shou, an extremely powerful motif for good fortune and longevity. Five bat motifs are very auspicious and hence very popular. I will feature more five bat designs in my Chinese Symbols ezine.
Other Chinese Good Luck Symbols fu:
God of Luck
Scepter (ru2 yi4)
Door Gods (men2 shen2)
Buddha's Hand (fo2 shou3)
Spring Couplet (chun1 lian2)
Chinese characters above: Fortune Star Shining Above