iPhone 12 has been rumored to launch 4 models, namely 2 high-end and 2 mainstream models, 6.1 inches, 5.4 inches and 6.7 inches, of which 2 models are 5.4 inches. There is one more model than the current iPhone 11 Pro Max, 11 Pro and 11.
The most mysterious is the 5.4-inch version of the iPhone 12, and from @L0vetodream's new iPhone naming method, this 5.4-inch iPhone 12 may be named iPhone 12 mini.
Apple currently uses the word "mini" in its iPad products. The most famous is of course the iPad mini, and there have been iPod mini products in the past.