From a technical perspective, Roku (ROKU) is looking like an interesting pick, as it just reached a key level of support. ROKU recently overtook the 50-day moving average, and this suggests a short-term bullish trend.The 50-day simple moving average is one of three major moving averages used by traders and analysts to determine support or resistance levels for a wide range of securities. But the 50-day is considered to be more important because it's the first marker of an up or down trend.ROKU could be on the verge of another rally after moving 9% higher over the last four weeks. Plus, the company is currently a Zacks Rank #1 (Strong Buy) stock.The bullish case solidifies once investors consider ROKU's positive earnings estimate revisions. No estimate has gone lower in the past two months for the current fiscal year, compared to 4 higher, while the consensus estimate has increased too.With a winning combination of earnings estimate revisions and hitting a key technical level, investors should keep their eye on ROKU for more gains in the near future. Zacks' Top Picks to Cash in on Artificial Intelligence In 2021, this world-changing technology is projected to generate $327.5 billion in revenue. Now Shark Tank star and billionaire investor Mark Cuban says AI will create "the world's first trillionaires." Zacks' urgent special report reveals 3 AI picks investors need to know about today.See 3 Artificial Intelligence Stocks With Extreme Upside Potential>>Want the latest recommendations from Zacks Investment Research? Today, you can download 7 Best Stocks for the Next 30 Days. Click to get this free report Roku, Inc. (ROKU): Free Stock Analysis Report To read this article on Zacks.com click here. Zacks Investment Research