sunshine, yang principle, positive, male, heaven, daytime
陽 centers on the bright, active, outward-facing side of things: sunshine, daytime, the yang principle, and by extension positive, male, or heavenly qualities.
陽 combines ⻖ (hill, mound) with 昜, which likely contributes the sound and the idea of brightness or rising. The character originally referred to the sunny side of a hill, extending to sunshine and the yang principle.
The hill radical ⻖ on the left and the bright 昜 on the right suggest the sunny side of a hill: the place where sunshine hits, representing daytime, positivity, and the yang principle.
For ヨウ, imagine the sun shining brightly and you saying 'Yo!' to greet the new day: Yo -> ヨウ, and the sunshine fills the scene.
Sun
(the) positive
sunlight
cheerful; jovial; merry; lively
cosmic dual forces; yin and yang; sun and moon, etc.
proton
positive (result)
solar system
south side of a mountain; Sanyo district
evening sun; setting sun
heat shimmer; heat haze; shimmering of hot air
morning sun; sunrise
sunshine; sunlight
bigleaf hydrangea (Hydrangea macrophylla); French hydrangea
diversion; distraction; feint
San'yō Shinkansen
setting sun
Shenyang (China)
solar heat
positron