Display resolution prefixes
Although the common standard prefixes super and ultra do not indicate specific modifiers to base standard resolutions, several others do:
Quarter (Q or q)
A quarter of the base resolution. E.g. QVGA, a term for a 320×240 resolution, half the width and height of VGA, hence the quarter total resolution. The "Q" prefix usually indicates "Quad" (4 times as many, not 1/4 times as many) in higher resolutions, and sometimes "q" is used instead of "Q" to specify quarter (by analogy with SI prefixes like k/K, m/M), but this usage is not consistent.
Wide (W)
The base resolution increased by increasing the width and keeping the height constant, for square or near-square pixels on a widescreen display, usually with an aspect ratio of either 16:9 or 16:10.
Quad(ruple) (Q)
Four times as many pixels compared to the base resolution, i.e. twice the horizontal and vertical resolution respectively.
Hex(adecatuple) (H)
Sixteen times as many pixels compared to the base resolution, i.e. four times the horizontal and vertical resolutions respectively.
Ultra (U)
eXtended (X)
These prefixes are also often combined, as in WQXGA or WHUXGA.
Other resolutions
There are also some other 4:3 ratio resolutions such as 1400×1050 SXGA+ and unnamed ones like 1152×864 (sometimes referred to as XGA+).
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