浜 means 'seashore'

All four kanji symbolize curving objects that have inspired fascinating creative leaps. Umbrella designs made people connect 傘 with domes, mushroom caps, snake eyes, and swords. Land and sea meet in a curvy line, so 浜 helps represent "wavy design" in everything from raked gravel to furniture to dog dishes. As "sickle," 鎌 drives words for crescent-shaped things (e.g., hamachi kama, curving ridges, a dolphin fin, and a dental tool). And the pear influences terms for pear-shaped islands and certain rounded body parts.