Left: mountain 山, right: and/together 与 (Arabic five 5 and one 一 is "and"-connection), here: Variation of island 岛 (= mountain 山, which only a bird 鸟/鳥 can reach)
Mnemonic
The mountain which only a simplified bird can reach, get is an islet. (In comparison to island 岛, the bird has only space at the side of the mountain.)
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