What does an upside down Capital Pi mean in math? What can it be used for? What is an example of such problem involving it? - Quora
![dℝ∅ℕ∋ on X: "@fermatslibrary Empty product, capital PI notation and factorial properties make it ovious why 0!=1 https://t.co/AzVLnGM869" / X dℝ∅ℕ∋ on X: "@fermatslibrary Empty product, capital PI notation and factorial properties make it ovious why 0!=1 https://t.co/AzVLnGM869" / X](https://pbs.twimg.com/media/DN4CYLxXkAAJx94.jpg)
dℝ∅ℕ∋ on X: "@fermatslibrary Empty product, capital PI notation and factorial properties make it ovious why 0!=1 https://t.co/AzVLnGM869" / X
![Pi greek symbol capital letter uppercase font icon outline black color vector illustration flat style simple image Stock Vector Image & Art - Alamy Pi greek symbol capital letter uppercase font icon outline black color vector illustration flat style simple image Stock Vector Image & Art - Alamy](https://l450v.alamy.com/450v/2bh87a3/pi-greek-symbol-capital-letter-uppercase-font-icon-outline-black-color-vector-illustration-flat-style-simple-image-2bh87a3.jpg)
Pi greek symbol capital letter uppercase font icon outline black color vector illustration flat style simple image Stock Vector Image & Art - Alamy
![Pi greek symbol capital letter uppercase font icon outline set black grey color vector illustration flat style simple image Stock Vector Image & Art - Alamy Pi greek symbol capital letter uppercase font icon outline set black grey color vector illustration flat style simple image Stock Vector Image & Art - Alamy](https://c8.alamy.com/comp/2BMWYJ1/pi-greek-symbol-capital-letter-uppercase-font-icon-outline-set-black-grey-color-vector-illustration-flat-style-simple-image-2BMWYJ1.jpg)
Pi greek symbol capital letter uppercase font icon outline set black grey color vector illustration flat style simple image Stock Vector Image & Art - Alamy
![Pi Greek Symbol Capital Letter Uppercase Font Icon in Circle Round Outline Black Color Vector Illustration Flat Style Image Stock Vector - Illustration of graphics, text: 184609696 Pi Greek Symbol Capital Letter Uppercase Font Icon in Circle Round Outline Black Color Vector Illustration Flat Style Image Stock Vector - Illustration of graphics, text: 184609696](https://thumbs.dreamstime.com/z/pi-greek-symbol-capital-letter-uppercase-font-icon-circle-round-outline-black-color-vector-illustration-flat-style-image-simple-184609696.jpg)
Pi Greek Symbol Capital Letter Uppercase Font Icon in Circle Round Outline Black Color Vector Illustration Flat Style Image Stock Vector - Illustration of graphics, text: 184609696
![math mode - Overrunning superscript in product written in “Pi notation” - TeX - LaTeX Stack Exchange math mode - Overrunning superscript in product written in “Pi notation” - TeX - LaTeX Stack Exchange](https://i.stack.imgur.com/irfRq.png)