three
弎 is an uncommon variant of 三, meaning three. It represents the number three itself.
弎 is a variant form of 三 (three), with 弋 added as a decorative or distinguishing outer element. The exact historical development is uncertain.
The outer 弋 frames the inner 三 (three), like a label around the number three. See the three horizontal strokes and remember: 弎 is three.
For サン, picture the sun (サン) shining on the three strokes of 三 inside 弋: sun -> サン, and the three strokes represent the number three.