delicate, minuteness, insignificance
微 centers on something so small or faint that it is barely noticeable: delicacy, minuteness, or insignificance.
微 combines 彳 (movement) with a phonetic element that also suggests smallness or concealment. The exact historical development of the right side is uncertain, but the overall meaning of something minute or subtle is well established.
The left side 彳 suggests a path, and the right side looks like a tiny mountain 山 with a small action 攵. Imagine walking along a path and noticing a mountain so small it's almost invisible—that's how delicate and insignificant 微 is.
For ビ, imagine a bee (ビー) so tiny and delicate that you can barely see it: bee -> ビ, and its minuteness matches the kanji's meaning.
subtle; delicate; fine
minuteness
slight; insignificant; small
to smile
microbe; germ
microscope
heartwarming; pleasant; charming; amusing
smile
microscopic
corpuscle; minute particle; particulate
minute; fine; detailed; subtle
minuscule amount; extremely small quantity
faint; dim; weak; slight; vague; indistinct; hazy
particle; atom; little piece
differentiation
slight; little; insignificant
slight fever
feeble; faint; weak
slight movement; slight tremor; quiver
little power; little influence