EXAMPLES FROM THE WEB FOR HIGH SIGN
That baby stare is the high sign of our fraternity--of blackbirds.
I'll give Weatherby the high sign an' make it back as quick as I can.
And when you're ready to have me operate—fifty-fifty—give me the high sign.
He passed the high sign to me, which I understood to mean "Let him talk."
Again did Elmer give the "high sign," and the others took heed.
Billy Grant, from his bed, gave the turban a high sign of greeting.
I'm going to stay until you give me the high sign to crawl out on the bank.
It was the high sign that in matters of terrible vengeance the Black Hand never muffs.
Herschenrother is now my middle name, and if it's not convenient to talk, you can give me the high sign.
You keep yer eyes peeled till I git back, and giv'm the high sign, d'yer hear?