Full HD
(FHD)
A term for 1080p, the better of the two main high-definition standards: 720p and 1080p.
See: 1080p
F stands for Full, and the alternative (720p) is known as just "HD" instead of "FHD".
See: HD
When referencing phone displays, a plus sign is sometimes added to acknowledge that the display actually has more pixels than 1080p. 1080p / FHD is technically 1920 x 1080 pixels, but a modern "FHD+"phone display might be 1080 x 2412 pixels, for example.