jade scepter or tablet (authority symbol)
珪 centers on a jade scepter or tablet used as a symbol of authority, typically held by rulers or officials.
珪 combines 王 (jade) with 圭, which likely contributes the sound and may also represent a jade tablet shape. The character specifically denotes a jade scepter or authority tablet.
The left side 王 (jade) and the right side 圭 (a stacked-earth shape) together suggest a jade tablet held by a ruler. Picture a gleaming jade scepter marked with the 圭 pattern, symbolizing authority.
For ケイ, imagine a king (K) holding the jade scepter and saying 'A' (ei) as he grants authority: K + ei -> ケイ. The king's jade tablet makes the sound ケイ.
diatomaceous earth; diatomite; siliceous marl; kieselguhr
diatom
Japanese Society of Diatomology
garnierite
silicified wood
silicide
chrysocolla
quartzite
pneumonoultramicroscopicsilicovolcanoconiosis; pneumonoultramicroscopicsilicovolcanokoniosis
wollastonite
silica
quartz sand; silica sand
sillimanite
silicosis
silicosis
geyserite
silicic; siliceous
siliceous sponge (any sponge other than those of class Calcarea)
siliceous sandstone
willemite