Long Right Double Arrow Symbol (⟹)

The long right double arrow symbol denotes logical implication in math.

What does the arrow pointing upward mean in math? - Quora

long-rightwards-double-arrow

⟺ - LONG LEFT RIGHT DOUBLE ARROW (U+27FA)

Is there a math symbol to indicate the 'difference between'? - Quora

Arrow symbols - ➚

Double orange arrow flat design long shadow color icon. Rewinding

2,774 Curved Double Arrow Royalty-Free Photos and Stock Images

Arrow Symbol

Double arrow vertical symbol - Free arrows icons

What is arrow notation in math? - Quora