I follow people doing cryprocurrencie TA on twitter and tradingview. There are a few people there using "magic "boxes to set a target and most of the time it's quite accurate. It's mostly used for altcoin TA.

Example: https://twitter.com/Crypto_Ed_NL/status/912208688739442688

Anyone know what those blue boxes are called?  I want to learn TA myself but could not find anything about targetboxes.