What does this blue triangle mean - PFF

Triangle Spiritual Meaning: 11 Symbolisms (It's Good or Bad?)

Garmin Says They Have Fixed the 'Blue Triangle of Death'

九连山保护区首次高清拍摄“蝶中皇后”金斑喙凤蝶_@所有人_澎湃新闻-The Paper

木兰青凤蝶的一生。