We've agreed to a "timeout" convention, where you can make a "T" with your hands (or say "timeout", in an audio conference).
In a stand-up or other meeting, it means "enough detail, let's get back on track".
For a conversation taking place in our work room, it means "would you please end this conversation or take it elsewhere".
By agreeing on a shorthand, the idea is that we can be brief without anyone taking offense at the brevity.
We agreed on following these stand-up conventions
Everyone reports what they were doing the workday before,
what they plan on doing next and
what's blocking them.
The facilitator chooses who starts
Everyone has approx. one minute
Topics which are up for longer/in-depth discussions are noted and discussed in post-stand-up or in a separate meeting