Welcome.
Please note that showing an image of the complete stamp would help the community assist you better. Your stamp appears to be a 2 cent from the 1922 - 1934 series as shown here

and NOT from the 1894 series as shown here

The triangles do not matter in the 1922-1934 series. You can learn more on the 1922-1934 series on these pages
https://stampsmarter.org/1847usa/19...ntifier.html and
https://stampsmarter.org/1847usa/19...4vs634A.htmlYou can learn more about the 1894 series here
https://stampsmarter.org/1847usa/18...leTypes.html and
https://stampsmarter.org/1847usa/18...leTypes.htmlYour stamps were the workhorses of the time and billions were printed. There are some rare varieties but the odds of you having one are much smaller then winning the mega-lottery and seeing Big Foot on the same day.
The differences between the common stamps and the rare varieties typically are subtle details like perforations and watermarks. Learning these takes some time and study but stamp collectors often enjoy the 'hunt'. The Stamp Smarter site linked in this post all the information you need to start your journey into collecting these stamps including free downloadable paper perforation gauges.
https://stampsmarter.org/learning/F...rfGauge.htmlIt also has a good Illustrated Glossary which will help you learn the collecting terminology
https://stampsmarter.org/Learning/G...aryHome.htmlDon