[ad_1] <br><img src="https://www.coindesk.com/resizer/mI9L1P_pIMnMohTrIuhlQg8EQrA=/800x600/cloudfront-us-east-1.images.arcpublishing.com/coindesk/BAS6BC7ICZEKNK6NMHVIHJEAFA.jpg" /><br>Exchange-traded fund (ETF) terminology can sometimes be tricky, and fund management giant BlackRock's application for a bitcoin ETF has raised some questions.