Line 21
Line 21 may refer to:
Closed Captioning[edit]
- EIA-608, a standard for closed captioning for NTSC TV broadcast, also known as "line 21 captions"
A Railway Line[edit]
In operation[edit]
- Line 21 (Guangzhou Metro), a metro line of the Guangzhou Metro in China
- Line 21 (Zürich), Switzerland
- Yangluo Line, a metro line of the Wuhan Metro in China
Under Planning[edit]
- Line 21 (São Paulo Metro), a future metro line of the São Paulo metro
- Line 21 (Shanghai Metro), a future metro line of Shanghai Metro
This disambiguation page lists articles associated with the title Line 21.
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