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The word "pyro" has multiple definitions: 

• Combining formMeans "fire," "heat," or "high temperature". It's used to form compound words like pyrogen, pyrolusite, and pyromancy. 
• ChemistryUsed in the names of inorganic acids to indicate that the acid's water content is intermediate between that of the corresponding ortho- and meta- acids. For example, pyroantimonic, H4Sb2O7, pyroarsenic, H4As2O7, and pyrosulfuric, H2S2O7. 
• NounAn informal term for a pyromaniac, which is someone who enjoys making or watching fires. The plural of pyro is pyros. 
• MineralogyHaving a property that changes upon the application of heat, or having a flame-colored appearance. For example, pyromorphite and pyroxylin. 

The word "pyro" comes from the Greek word pur, which means "fire". 

The formula is as follows: 25% of ammonium perchlorate, 55% of nitrocellulose (the average nitrogen content is 11.8%), and 20% of 100-mesh titanium powder; are all in mass percent.

Cold pyro smokeless is a type of firework that is used for events and celebrations and is characterized by its sparkling, smokeless, and colorful appearance.