small, edible, helical fresh-water mollusk
螺 centers on a small, edible freshwater mollusk with a helical shell. The spiral shape is the key idea, and the meaning extends naturally to anything coiled like a snail shell.
螺 combines 虫 (insect/creature) with 累, which likely contributes the sound and the idea of piling up or coiling, matching the spiral shell.
The insect radical 虫 on the left and the piled-up shape 累 on the right suggest a small creature with a coiled, stacked shell: a spiral freshwater snail.
For ラ, imagine a snail singing 'la la la' as it spirals up its shell: la -> ラ, and the happy mollusk coils along.
screw
boasting; bragging; big talk
spiral; helix
turban shell (any mollusc of the family Turbinidae, esp. the horned turban, Turbo cornutus)
small spiral-shelled snail; spiral shellfish
whelk (esp. Neptunea and Buccinum spp.)
pond snail (Viviparidae spp.)
nacre; mother of pearl
Archimedean spiral
Tectus maximus (species of top shell)
double helix (structure of DNA)
arthritic neptune (species of whelk, Neptunea arthritica)
logarithmic spiral; equiangular spiral
double-sculptured neptune (species of whelk, Neptunea intersculpta)
warty frog shell (Bursa bufonia dunkeri)
Thais clavigera (species of rock shell)
bladder moon shell (Glossaulax didyma)
biluochun (green tea var. grown in Jiangsu, China)
tapestry turban (species of turban shell, Turbo petholatus)
trapezium horse conch (Pleuroploca trapezium)