Quiet Period
In terms of an IPO, the period where an issuer is subject to a SEC ban on promotional publicity. The quiet period usually lasts either 40 or 90 days from the IPO.
Investopedia Commentary
In other words, If you take your company public, you can't talk about your stock to anybody for 3 months.
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IPO Basics Tutorial
quiet period
The period of time during which a security issue is in registration and the issuer is not permitted to promote the issue. The quiet period begins during the filing period and ends 25 days after the security begins trading.
See lockdown.