What is 2²⁰, and what unit does it define?

1048576 — one mebibyte (MiB): 1024 × 1024 bytes ≈ 1.05 million.

The story: a pair of dice rest on a roof; below, a bent leg wears a single shoe.

Chunk 1048576 → 10 · 48 · 57 · 6 → dice · roof · leg · shoe. 2²⁰ = 1,048,576 bytes is the binary "megabyte" (MiB) — the reason a 1 MB file and a "1 MB" of RAM historically differed slightly.

Tip: Every three exponent steps (2¹⁰→2²⁰→2³⁰) climbs one unit: kibi → mebi → gibi.