Triangle significance?

Is there a significance to triangle shapes? I know that some people notice certain numbers quite frequently; well I've been noticing certain shapes (mostly triangles). Does anyone have any experience with this or maybe some information?

Triangle have been of quite Significance though many century's,

Triangles are used as symbols and used to be what temples where based on,

Here an interesting read on that, www.ldshistory.net...

Im sure other here will have some more ideas for you mines just a starter,

interesting though ...