以 means “from, beyond”

い · i

Also: by means of, because, in view of, compared with

Kun'yomi (Japanese reading)
もって
On'yomi (Chinese reading)
イ

JLPT N4 · Taught in grade 4 · 5 strokes

The story

An ancient figure carrying a tool: taking something as your starting point. 以 draws a line in the sand: everything 以上 stands above it, everything 以下 below, everything 以外 outside it.

Used in 以上 (ijou, more than), 以下 (ika, less than), and 以外 (igai, except for)

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Readings from KANJIDIC2, © EDRDG, CC BY-SA.