The most important number for the market: 2.75%

Round integers like 1,700 on the S&P 500 are well and good, but savvy traders have their minds on another number: 2.75 percent

That was the high for the 10-year yield this year, and traders say yields are bound to go back to that level. The one overhanging question is how stocks will react when they see that number.

"If we start to push up to new highs on the 10-year yield so that's the 2.75 level—I think you'd probably see a bit of anxiety creep back into the marketplace," Bank of America Merrill Lynch's head of global technical strategy, MacNeil Curry, told "Futures Now" on Tuesday.

And Curry sees yields getting back to that level in the short term, and then some. "In the next couple of weeks to two months or so I think we've got a push coming up to the 2.85, 2.95 zone," he said.

(Read more: US Treasurys widen losses after data hints at less stimulus)

Jim Iuorio, the managing director of TJM Institutional Services and a CNBC contributor, thinks the old highs for the 10-year yield are in the cards, but he says that's because of expectations about what Federal Reserve Chairman Ben Bernanke might be thinking.

"The chairman wants to control volatility by sending rates up to a higher level, but he wants to control the rate at which they go higher. The spike up to 2.75 that happened three weeks ago alarmed him," Iuorio said. "Now the market thinks he's ready to start opening the door a little further. So we're headed back to those old highs."

(Read more: Why I'm selling bonds ahead of the Fed)

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Curry reiterates that pace is an important component of how the market responds to a rise in yields. He said the market will be much more anxious if the bump "transpired on the backdrop of an acceleration to the topside, as opposed to a gradual push higher."

Indeed, stocks didn't sell off when the 10-year yield hit 2.75 percent in early July. But when yields rose from 2.1 percent to 2.7 over the course of one taper-obsessed week in June, the market dropped rapidly.

Either way, iiTrader CEO Rich Ilczyszyn says the trend is loud and clear. "This chart clearly shows that the market is poised for some type of tapering, and yields will go higher," Ilczyszyn said.

So while the market might fret over higher yields, these traders believe the charts are already sending stocks the memo that they're coming soon.

—By CNBC's Alex Rosenberg. Follow him on Twitter: @CNBCAlex.

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