Asus RT-N10 (VER.D1) - Manual (Page 40)

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. Create and key in a passphrase consisting of 8-63 characters or
use the automatically generated passphrase then click Next.
A passphrase is a sentence, phrase, or sequence of alpha-
numeric characters used to generate a security key.
4. Key in desired network name or SSID (Service Set Identifier).
When done, click Next.